Prime Movers A 1941 GMC CCKW-352 truck and M18 searchlight trailer. Stenciled on the door is “77th CA AA Bat A,” indicating that the tandem belongs to the 77th Coastal Artillery (AA) Regiment (Colored) stationed at Fort Bragg, NC. Via LIFE Magazine. A 1942 Chevrolet 4×4 truck used by searchlight battalions.