Overwhelmingly, when a woman claims a man has assaulted her, it's because he has. It's an everyday occurrance, particularly in the military where the Pentagon says 38 men are raped every day (by other men) - God only knows how many women are, but at least 85% are sexually harassed. Only in very particular situations with particular dynamics does a woman make a false accusation. I'm going to say, without knowning any of the facts beyond what you've written here, that this woman is a double victim - both of Riggins and of the rape culture that she lives in. Men get away with destroying women's lives on a daily basis - particular within the US Military. Shaming and blaming them them for that is just another manifestation of a toxic androcentric culture. You should be fucking ashamed of yourself for this entire essay. It wouldn’t have hurt his reputation and career if they weren’t pretty sure that he’d absolutely done everything she accused him of.
It's not like it's some sort of secret that rape is rampant in the military and that the chain of command upholds and perpetuates it. Don't be an ass - it makes you look stupid and weak and also like a raging misogynist.