I can't find anything about him being in the Army either.
Marc is a very interesting housemate though IMO and he has basically admitted that he isn't as upfront and cocky as he tries to act which ties in exactly with what someone who knows him in real life said about him, I like to try work out BB housemates, how they will react and what they will say to certain situations and so on, so housemates that are as shallow as a puddle don't really interest me.
One of the most important things that makes him so likable to me is that he doesn't take everything so seriously in there, he is taking BB for what it is, a TV show that they are only going to be part of for a couple of months of their lives so he is trying to have fun, mess around, get drunk and enjoy it the best he can, a lot of the original housemates on the other hand are being far too serious about every little thing and it does get tiring to watch, I mean last night Marcus narrated that Joel had been 'interviewing' his housemates in the bedroom for over an hour, I couldn't be bothered with all that if I was in there tbh
Marc will be the housemate that's remembered from this serious.
Anyway yeah, I don't think Marcs a bad person, or a bully or whatever else is getting thrown around about him, he definitely does go too far with his comments at times yes but you can tell he's genuinely sorry when it gets brought up to him.
Other than that, the guy is ****ing hilarious, I haven't laughed so much at this BB since he entered the house and I'm definitely glad he did.