Its a shame we've come to the point where this is even considered a legitimate question.
Shes not right, every Marine is supposed to be a rifleman. That means even the clerks and cooks can be on the front line with others depending on them for survival.
What is particularly falling is that the Marines were the only branch not to knuckle under and agree without a fight. They were the only branch to request an exclusion, and conducted an exhaustive study to back it up. The SecNav responded by insulting their integrity and overruling them.
But that study is still out there, and any candidate could use that as ammo to fight this policy. Apparently, most of them just weren't man enough to do so.