Also, 4 out of your 10 marines are actually F4F Wildcat fighters. The Zeros and Wildcats have to do with a rule about carrier fighters with a reduced price tag and a reduced move (from 4 to 3, I seem to remember).
@Cloudesley Infantrymen will fit on the roundels – so it’s easy to keep track, and I place them next to the board so everyone can see them to strategize