USAG Fort Greely, located in Alaska, stands as the coldest and windiest installation within IMCOM, reaching temperatures as low as -55 in 2008, and plunging to -69 with wind chill on 15 days. It experiences frequent occurrences of -40 temperatures and wind gusts ranging from 50 to 80 mph, with a recorded maximum of 84 mph during the past three years. Notably, Fort Greely holds the distinction of being the sole Army installation to close under BRAC and subsequently reopen.

The population of Fort Greely totals 1,644 individuals, encompassing various categories: 21 active-duty Army personnel, 200 Alaska Army National Guard members, 294 Army civilian employees, 67 NAF (Non-Appropriated Fund) workers, 393 contractors, 151 military dependents residing in RCI Housing, 134 retirees, and 367 dependents of retirees.

Mission partners and units at Fort Greely include the Missile Defense Agency, 49th Missile Defense Battalion, Arctic Regions Test Center, Medical Department Activity (MEDDAC), Army Material Command, 59th Signal Battalion, United States Army Alaska (USARAK), United States Army Corps of Engineers (USACE), Army and Air Force Exchange Service (AAFES), Defense Commissary Agency (DeCA), Doyon Utilities, and Wolf Creek Federal Services.

USAG Fort Greely has 84 RCI Family Homes.

The garrison commander at Fort Greely reports to both Installation Management Command through the Pacific Area Region Office and the senior commander through the 11th Airborne Division.