Back in the day, the individualists pledged Gamma Delta Iota (aka - G Damned Independents). Life gives us hazing enough, not to mention DI’s in Basic.
Back in college an acquaintance was in ROTC. He pledged some Frat and went through the whole thing, and this was back when hazing and stuff was a big deal to weed most of the pledges out. At the final ceremony when he was supposed to raise his hand or whatever he declined, said he just did it to prove that frat guys aren't special and left the house. I think he also said something about how they were pussies compared to the military.
Maybe in an odd way it was his own way of preparing for Basic?