What undies are issued in Navy RTC?

Now I've hear that it's just Whitie Tighties, but do you get the other option of boxers? Well if they are whitie tighties then I better get used to them cuz right now I wear boxer briefs and I like the support and the leg section really helps my groin area thighs from chafing. And not to get personal but I get crouch stains, not to be confused with skids it's like I sweat and the sweat stains aculate under neath my to my . Plus I better make sure my is clean cuz when i work hard and bend over, my like to eat my undies and then it looks like I have a wedgie so when that happens I dont wanna pull out the light skids that can show up on white underwear. Advice of words of wisdom would be nice thank you!!!!