Are military contract marriages known to fail?

I’m thinking about entering into a contract marriage with a friend of 3 years in the Marine Corps who is deploying to Okinawa, Japan, for 2 years soon. I recently got out of an abusive relationship & would love to just escape the after-effects & start anew. Not only would this benefit him but me as well; he will get more money & be able to live off-base, & I will be able to get extra income as well as the benefits, which I NEED. I was born with a cleft lip, & although had surgeries throughout my life, my last surgery before my insurance ran out made my lip obviously fatter & completely noticeable. I would like to move to Japan with him & try it out for 4 months or so, but I know I’ll be able to come back if it’s not for me, & still have a little extra money in my pocket which I desperately need. Anyone know much about contract marriages, or anyone who’s been in one? This is new territory for me, & I would like to be more knowledgeable of it before making my final decision. This is a friend I can trust, no doubt about it. We would look kind of awkward in public seeing that he’s shorter than me, but oh well. I was wondering if anyone knows how often they are investigated? What would tip them off?