So, I was just reading this opinion piece by the transgender former SEAL: http://www.cnn.com/2014/09/02/opinion/lady....html?hpt=us_r1
I realized that a transgender former SEAL is the best concept ever for an action adventure RPG. It would be great for a Red Dawn scenario where the Chinese invade New Mexico, or something like that.
The occupiers don't suspect that the main character is a former SEAL due to the gender change, so the main character decides to basically pull a Red Dawn and fight the invaders.
Since the main character is kind of rusty, this explains RPG-style rapid advancement of skills. The explanation is that you're just recovering the skills and fitness levels you haven't had in a while.
I can see lots of room for humor in dialogue, too, doing things like recruiting the local high school varsity team ("WOLVERINES!!!!") etc.