Welcome to the 20th Engineer Brigade!

  • 92nd Engineer Battalion

    92nd Engineer Battalion

  • 74th Dive Detachment

    74th Dive Detachment

  • 46th Engineer Battalion

    46th Engineer Battalion

    Hurricane Ida Relief Operations, 46th Engineer Battalion 

  • 27th Engineer Battalion

    27th Engineer Battalion

  • 86th Dive Detachment

    86th Dive Detachment

    Underwater broco cutting on ibeams

  • 19th Engineer Battalion

    19th Engineer Battalion


Our mission is to provide proactive, timely, and essential expeditionary engineer support to the XVIII Corps, the Army, and when directed, joint and special operations forces. 

The 20th Engineer Brigade is a combat engineer brigade assigned to the XVIII Airborne Corps of the United States Army stationed at Fort Bragg, North Carolina.  The 20TH Engineer Brigade currently consists of four engineer battalions headquartered throughout the eastern United States.  The Brigade Headquarters and Headquarters Company (HHC) as well as the 27TH Engineer Battalion (A) are headquartered at Fort Bragg, North Carolina. The 19TH Engineer Battalion (Construction Effects) is located at Fort Knox, Kentucky, the 46TH Engineer Battalion is located at Fort Polk, LA and the 92ND Engineer Battalion is located at Fort Stewart, Georgia. Soldiers of the 20th Engineer Brigade provide various supportive duties to other Army units, including construction, engineering, and mechanical work on other Army projects. 

20th Engineer Brigade Units 


Brigade Commander, COL Herlihy


A native of East Tennessee, COL Dan Herlihy commissioned in 2001 as a 2nd Lieutenant in the Engineer Regiment after graduating from Tennessee Technological University with a Bachelor of Science degree in Civil Engineering. After completing the Engineer Officer Basic Course, COL Herlihy served in the 37th Engineer Battalion (Combat) (Airborne) at Fort Bragg, North Carolina as a Sapper Platoon Leader, Light Equipment Platoon Leader, Company Executive Officer, and Battalion Air Officer.

After completing the Engineer Captain’s Career Course, Col Herlihy earned a Master of Science degree in Civil Engineer from Missouri University of Science and Technology before being assigned to the 3rd Infantry Division at Fort Stewart, Georgia. While at Fort Stewart, he served as the 92nd Engineer Battalion (Combat Heavy) Civil Engineer before assuming command of Bravo Company, 92nd Engineers.

Following company command, COL Herlihy served as an Executive Officer and Engineer Squadron Commander in the United States Army Special Operations Command (USASOC) at Fort Bragg, North Carolina. COL Herlihy later served as the Deputy District Commander for the New England District, U.S. Army Corps of Engineers in Concord, Massachusetts before returning in Fort Bragg, NC to command the 37th Brigade Engineer Battalion, 2nd Brigade Combat Team, 82nd Airborne Division from 2017-2019. Following battalion command COL Herlihy served as executive officer to the XVIII Airborne Corps Commanding General.

COL Herlihy most recently served as military faculty as the School of Advanced Military Studies at Fort Leavenworth, KS. His operational deployments include multiple tours of duty in Iraq and Afghanistan. He is a licensed Professional Engineer (P.E.), a certified Project Management Professional (PMP), and holds master’s degrees in civil engineering and strategic studies.

Brigade Command Sergeant Major, CSM Arroyo

ARROYO MICHAEL 13FEB23 CSM original.jpg

Command Sergeant Major Michael Arroyo is a native of The Bronx, NY. He first enlisted in the United States Army in June 1998 as a Horizontal Construction Engineer.

CSM Arroyo has served in all enlisted leadership positions through Command Sergeant Major. His assignments include tours with the 62nd Engineer Battalion, Fort Hood, TX, 27th Engineer Battalion (C) (A), Fort Bragg, N.C., 173rd Infantry Brigade Combat Team (A), Vicenza, Italy, 554 Engineer Battalion, Fort Leonard Wood, MO, 31st Engineer Battalion, Fort Leonard Wood, MO, Supreme Headquarters Allied Powers Europe (SHAPE), Mons, Belgium, 6th Brigade Engineer Battalion (A), Joint Base Elmendorf Richardson, AK, and 2nd Infantry Division, Republic of Korea United States Combined Division (RUCD), Camp Humphreys, Republic of Korea, and 91st Brigade Engineer Battalion, 1ABCT, 1st Cavalry Division.

CSM Arroyo holds a Bachelor of Professional Studies in Business and Management and is currently completing his Master of Business Administration (MBA) from Excelsior College.

CSM Arroyo’s military education includes all NCOES courses to include the United States Sergeants Majors Academy class 68, Department of Defense Mission Assurance Assessment Course, Master Resiliency Course, Modern Army Combatives Course levels 1 and 2, Joint Engineer Operations Course, Advance Anti-Terrorism Officer’s Course, First Sergeant’s Course, Battle Staff Course, Environmental Compliance Course, Contracting Officer Representative Course, Jumpmaster School, Air Movement Operations Course, Equal Opportunity Leader’s Course, and the Basic Airborne Course.

CSM Arroyo’s awards include; Bronze Star Medal (2OLC), Defense Meritorious Service Medal, Meritorious Service Medal (1OLC), Army Commendation Medal (4OLC), Army Achievement Medal (1SOLC), Joint Meritorious Unit Award, Meritorious Unit Citation, Army Good Conduct Medal (7th award), National Defense Service Medal,  Korea Defense Service Medal, Kosovo Campaign Medal (1 Bronze Service Star), Afghanistan Campaign Medal (2 Campaign Stars), Global War on Terror Expeditionary Medal, Global War on Terror Service Medal, Humanitarian Service Medal, Military Outstanding Volunteer Service Medal, Noncommissioned Officer Professional Development Ribbon (Numeral 5), Army Service Ribbon, NATO Medal, Combat Action Badge, Senior Parachutist Badge, and Romanian Airborne Wings. CSM Arroyo is also a recipient of the Bronze De Fleury Medal. 

Incoming Soldiers

Welcome to the 20th Engineer Brigade! 


Welcome to the 20th Engineer Brigade! 

Please see the attached welcome packet, and inprocessing packet  for an easy transition to the 20th Engineer Brigade. If you would like sponsor click on the attachement for contact information.  We look forward to meeting you! 

Welcome to the Team! 



  • 20th Engineer Brigade

    20th Engineer Brigade

  • Engineer Soldiers on a M113

    Engineer Soldiers on a M113

  • Engineer Paratroopers

    Engineer Paratroopers

  • 20th Engineer Brigade in Vietnam

    20th Engineer Brigade in Vietnam

  • Engineer Soldiers on a M113

    Engineer Soldiers on a M113

  • Airborne!


History of the 20th Engineer Brigade

     The lineage and honors of the 20th Engineer Brigade date back to the Civil War when it was first organized December 31, 1861 in the Regular Army as a provisional engineer battalion. Unit designations have changes many times since then as predecessors of the 20th Engineer Brigade served in the War with Spain, the Philippine insurrection, the Mexican Expedition and World War I and II. 

     On August 16, 1950, the brigade was first designated as the 20th Engineer Brigade and activated at Fort Leonard Wood, MO. In November 1952 the brigade deployed to France where it was assigned to the European Theater Communications Zone and provided engineer construction support in the area of southwestern France. Upon redeploying back to the United States, the brigade colors were first unfurled at Fort Bragg, NC on September 10th, 1954. From that time until its inactivation on December 12, 1958, the brigade provided engineer support to XVIII Airborne Corps operations in and around Fort Bragg and the southeast United States. 

     The Brigade Headquarters was reactivated on May 1, 1967 at Fort Bragg and deployed to Vietnam in early August. During the Vietnam Conflict, the brigade consisted of over 13,000 soldiers organized into three engineer groups having 14 battalions and 31 separate companies and detachments. During its time in Vietnam the brigade provided all non-divisional engineer support in military Regions III and IV through eleven different campaigns. The brigade was inactivated in Vietnam on September 20, 1971.  On June 21, 1974, the 20th Engineer Brigade was again reactivated, this time as an “Airborne” engineer brigade, and was assigned to XVIII Airborne Corps. In the early years, the airborne brigade provided rapid engineer response to both national and international military contingencies and disaster relief missions while supporting XVIII Airborne Corps operations with critical combat engineer, construction, topographical and bridging support.  

     On August 2, 1990 the brigade was called upon to support the multinational response to the Iraqi invasion of Kuwait. The Brigade grew to a 7,700 soldier fighting force composed of three groups, ten battalions, four separate companies and 8 detachments in support of Operation Desert Shield and Storm. The brigade provided mission essential combat engineering and topographical support to XVIII Airborne Corps. The Brigade completed 1,500 combat heavy day of work constructing roads, airfields, heliports, ammunition/fuel/water storage points, life support areas and forward landing strips, distributed over ten million maps, trained over 5,00 coalition engineers, and supported the French attack on Assalman airfield. During follow-on missions the Brigade destroyed over 6,000 enemy bunkers and one million tons of munitions. 

     Throughout the years the brigade has deployed in support of operations across the entire spectrum of conflict from disaster relief to combat operations. In 1992, the brigade provided relief in the wake of Hurricane Andrew, and in September 1994, the brigade deployed to Haiti in support of Operation Uphold Democracy.  As the Global War on Terrorism connected the brigade deployment elements to Southwest Asia in support of Operation Enduring Freedom and Operation Iraqi Freedom where they conducted mobility, constructed roads, airfields and base camps, and provided vital geospatial missions. In November 2004 and July 2007 the brigade headquarters was deployed to Iraq where it served as the Multi-National Corps – Iraq engineer headquarters exercising command and control over all non-divisional engineers throughout Iraq. 

     On September 16, 2009 the 20th Engineer Brigade transformed to its new MTOE with the headquarters being removed from airborne status, but the brigade’s mission to support XVIII Airborne Corps and the Army with trained and ready airborne engineers continued. In January 2010 the brigade deployed the Assault Command Post to Haiti in support of Operation Unified Response, and 12 months later, in January 2011, deployed the brigade headquarters to Iraq in support of operation New Dawn. There it served as the U.S Forces – Iraq theater engineer brigade headquarters for all non-divisional engineers throughout Iraq. 

     Today the 20th Engineer Brigade consists of four battalions and multiple separate companies and detachments numbering over 3,000 soldiers across seven different installations.  The battalions include the 19th Engineer Battalion located at Fort Knox, the 27th Engineer Battalion located at Fort Bragg, the 46th Engineer Battalion located at Fort Polk, and 92nd Engineer Battalion located at Fort Stewart. The 20th Engineer Brigade also contains four dive detachments located at Joint Base Langley Eustis, three engineer companies located at Fort Campbell and one engineer company located at Fort Drum.  On August 31st, 2021, 46th Engineer Battalion 20th EN BDE, first U.S Army active-duty hurricane response force, deployed from Joint Readiness Training Center and Fort Polk, to support Hurricane Ida response operations. The 46th mobilized more than 150 Soldiers and 51 pieces of equipment in 48 hours. Their ability to assemble and deploy is a testament to the ongoing cooperation between civil and military forces across the total Army.

     The 20th Engineer Brigade continues to stand ready to provide rapid engineer support in response to any worldwide contingency mission. The brigade holds true its long and distinguished history of service to the XVIII Airborne Corps, the Engineer Regiment, our Army and Nation participating in 33 campaigns and earning 8 Meritorious Unit Commendations.    

For More Information: 

Links & FAQ's

Helpful links: 


Where is the 20th Engineer Brigade located?

The 20th Engineer Brigade headquarters is located at Fort Bragg, NC, along with one of its four battalions, the 27th Engineer Battalion. The 19th Engineer Battalion is located at Fort Knox, KY, 46th Engineer Battalion is locates at Fort Polk, LA and the 92nd Engineer Battalion is located at Fort Stewart, GA. The 20th Engineer Brigade also consists of engineer assets located at Fort Drum, NY, Fort Campbell, KY, and four Engineer Dive Detachments located at Joint Base Langley-Eustis, VA.

Do I inprocess into the 20th Engineer Brigade or the 27th Engineer Battalion (A)?

If your orders directly state 27th Engineer Battalion, then you will go to Battalion S1. If your orders state the 20th Engineer Brigade then you will inprocess through Brigade S1.

Where do I inprocess on Fort Bragg?

Prior to inprocesing into the 20th Engineer Brigade, you will inprocess through Fort Bragg.

Go to Fort Bragg 18th Replacement Company, building 4-1238 on Normandy Drive.

Phone: (910)396-4250 Open 24/7

Closing Tab