Transgendered Sideswitching in the Military, Eh?!?

Listen up, numbskull! You clearly ain't got the brainpower to figure this one out on your own. The "joke" here is that trans people might "switch sides" which is supposed to be funny because it implies they are fickle or unreliable, just like they "switched" genders. Get it? Or do I need to draw you a picture?