Winning competitions maybe.

The game has been out for 6 months now. I wouldn't be surprised to see people sporting those emblems. As Redneck said, it may have been achieved by winning Elite competitions.

Seems unlikely they got gem through elite competitions.  The clan level is capped at 50 and emblems start being rewarded i think in the 20+ levels. Highest clan rank i saw before clan ops because of founder status was 24. Even if they got clan xp through doing the ops that were offered they would have literaly of had to win champion(1st) which is 2,500xp in every op to rank up enough to unlock them. Hacked seems more likely to me, consdering that IW security is a joke and an 11 year old can apperantly infiltrate and infect lobbies :/

i have just seen one here on the forums. i remembered someone posted this guy that hacked the game so he had the MOAB emblem, 15 custom classes and prestige 20

Someone said that the U.K. limited edition version comes with a booklet of info that says that there is a title for getting a certain number of MOABs. The challenge only goes to 250.