Katy didn't dress in drag for POM video. She taped/strapped down those boobs, which is common, so they don't get in the way of the job. You try doing all that stuff with big boobies flopping this way and that, coming out of this and that bra, ect.
And altho some don't get it, I have seen many that do.... it's not so much a msg about "join the army when u break up with your boyfriend." it's more about "finding power in who you are and what you can be and do when life knocks ya down." (it's nearly 4am, so forgive the lack of beautiful words, lol, but I hope that makes sense)