[7] Another detachment from the battalion supported the 1st Marine Aircraft Wing's occupation of Green Island.

Seizure of both of these islands within the Bismarck Archipelago were critical in the effort to bypass the main Japanese airfield at Rabaul.

Its mission was to utilize smoke generators during enemy bombing raids with the purpose of obscuring friendly targets.

[2] During the first week of June 1944 the battalion was divided into three echelons to be part of the Southern Attack Force for the upcoming assault to recapture Guam.

On the morning of July 21, 1944 an advanced party from the 14th Defense Battalion went ashore on Guam from the USS President Monroe (AP-104).

[8] On July 23, the battalion received orders to occupy Cabras Island in Apra Harbor.

The smokescreen unit that had been attached to the battalion prior to the battle was disbanded in July 1944 because the concept did not prove feasible.

[3] The battalion spent the remainder of their time as part of the garrison force on Guam and was decommissioned there on June 30, 1945 before the end of the war.