The long northern winter affords the opportunity for an informal class in ships identification. In the cramped quarters of a Yakutat hut, by the light of a coleman lamp, Ltjg. R. Delafield, Air Combat Intelligence Officer, instructs the officers around the table. From left to right are F.R. Robinson, warrant carpenter, Ltjg. J.W. Sahlman, Ensign J.J. Romero, and Ltjg. Royal A. Lett.