[6] In June 1943 the battalion left Guadalcanal and took part in the Landings on Rendova, set up its artillery and fought off attempts by the Japanese to regain control.

[7] At noon on July 2, the battalion's SCR-602 and SCR-270 radars were inoperable when a large Japanese formation of aircraft attacked the Rendova beachhead.

This attack killed more than 30 Americans, wounded another 200+ and caused extensive damage to infrastructure, fuel dumps and the battalion's 155 mm artillery.

[13] On Guam most of the Japanese defenders retreated to the cliffs at the northern end of the island where thousands committed suicide by jumping to their deaths.

[2] The unit remained on Guam for the duration of the war and returned to Marine Corps Base Camp Lejeune, North Carolina in February 1946.

In August 1948, the battalion embarked departed Guam on board the USS George Clymer (APA-27) arriving at Courthouse Bay, Marine Corps Base Camp LeJeune, North Carolina on September 13, 1948.

In October 1949, the battalion took part in Operation Normex, cold weather maneuvers that took place on the Labrador Peninsula, Canada.

The 2d 90mm AAA Gun Bn continued training aboard Camp Geiger until October 1953 at which time the battalion embarked upon LSTs for transport to the west coast.

The LSTs docked in San Diego and the battalion convoyed to its new base at Marine Corps Training Center Twentynine Palms, California.