The "Ivy Eagles" were first activated as the 4th Aviation Company, 4th Infantry Division, at Fort Lewis, Washington, April 1, 1957. It was then reorganized and redesignated Oct. 1, 1963, as the Headquarters and Headquarters Company, 4th Aviation Battalion.

The 4th Aviation Battalion deployed to the Republic of Vietnam in September 1966, where it participated in multiple campaigns and was awarded two Republic of Vietnam Crosses of Gallantry and one Republic of Vietnam Civil Action Honor Medal. The unit redeployed to the U.S. in 1970 where it was inactivated at Fort Lewis, Washington, Dec. 4, 1970.

The 4th Aviation Battalion was activated at Fort Carson, Colorado, and redesignated the Aviation Company, 4th Inf. Div., Nov. 21, 1972. It was again reorganized and redesignated March 17, 1980, as HHC, 4th Aviation Battalion, and again Aug. 16, 1987, as 4th Aviation. In 1995, the unit relocated to Fort Hood, Texas, with the 4th Inf. Div. On Oct. 1, 2005, the unit was redesignated as the 4th Aviation Regiment.

The 4th Combat Aviation Brigade, 4th Inf. Div., deployed in 2005 and 2008 in support of Operation Iraqi Freedom and was awarded two Meritorious Unit Citations. The unit's most recent deployment was in 2010 in support of Operation Enduring Freedom, after which 4th CAB was awarded a Valorous Unit Award. Task Force Iron Eagle supported 22 allied nations across four Regional Commands, the largest geographical area of any combat aviation brigade.

The 4th CAB, 4th Inf. Div., was inactivated at Fort Hood, Texas, September 2011. The 4th CAB HHC was reactivated July 2, 2013, at Fort Carson, Colorado.

The 2nd General Support Aviation Battalion, 4th Avn. Reg., 4th CAB, was the first battalion to reactivate at Fort Carson, Colorado, in April 2013. In May 2014, the remaining four battalions that comprise the 4th CAB now were activated. They are the 6th Attack Reconnaissance Squadron, 17th Cavalry Regiment; 3rd Assault Helicopter Battalion, 4th Avn. Reg.; 4th Attack Reconnaissance Battalion, 4th Avn. Reg.; and 404th Aviation Support Battalion.

The 4th ARB deployed in May 2018 to the U.S. Central Command area of operations to support Operation Freedom’s Sentinel (OFS), Operation Inherent Resolve (OIR) and Operation Spartan Shield (OSS).

The 4th CAB deployed in June 2018 to Europe to support the Atlantic Resolve mission, which builds readiness, increases interoperability and enhances the bonds between ally and partner militaries with multinational training events in Bulgaria, Estonia, Hungary, Latvia, Lithuania, Poland and Romania.