Redesignated on September 30, 1945, as the 4th Amphibian Tractor Battalion, Fleet Marine Force, Pacific.

Although destroyed bridges were an obstacle to many units, the AAV's ability to cross the major rivers was an integral part of the overall mission.

The 4th AABn has deployed company sized elements in support of Combined Joint Task Force-Horn of Africa.

The Marines ventured out into 70 plus mile per hour winds and navigated through a wall of water that Katrina dumped on the cities of Gulfport and Biloxi.

[1] Bravo Company (-) reservists from Jacksonville, Florida, deployed to New Orleans in support of rescue and recovery operations.

Alpha Company, 4th Assault Amphibian Battalion, was deployed to Iraq in 2008 to support Regimental Combat Team 5.

In 2011, the unit also participated in the Landing Force Cooperation Afloat Readiness and Training (LF CARAT)[2] exercises in Thailand.

In 2023 and 2024, the 4th AABn commenced a transition concurrent with the Marine Corps' eventual replacement of the tracked AAV-P7/A1 with the 8-wheel ACV-30 Amphibious Combat Vehicle.