By the way, why did Pop have to pull strings to get Michael a deferment? During the early part of the War, college students were exempt.
US instituted a draft lottery in September 1940. A student deferment was available, but I'm guessing that Michael didn't apply for one. Another guess: Vito (through Tom) automatically got deferments for everyone he valued, including button men. The novel says Paulie Gatto had a deferment (mental issues, "shock treatments") courtesy of Vito.
Ntra la porta tua lu sangu � sparsu, E nun me mporta si ce muoru accisu... E s'iddu muoru e vaju mparadisu Si nun ce truovo a ttia, mancu ce trasu.