"Moosehead" carried out her most important service as an at-sea platform for training officers and men of Combat Information Center crews. She carried the latest radar and sonar equipment as well as a CIC classroom and berthing facilities. In July 1943 she began training CIC crews of escort carriers. During the next two and a half years she trained CIC teams for all escort carriers of the and classes. Early in 1944 she broadened the scope of her training to include CIC teams from APAs, AKAs, DEs, ADs, and PCEs. In addition, she served as a test and evaluation ship for experimental rockets, radar equipment, and radio jamming devices.