Devlin vs. Garret?
More of a glitch than a hint really but, if you did not notice, when you first recruit Ewan he mentions that his last name is Devlin ;however when he delivers a helicopter to you in the field use your binoculars and you will discover that according the the binoculars he is in fact Ewan Garret. So I will leave you with the evidence and let you decide Garret or Devlin?
More tricks, tips and cheats for this game are right here - Mercenaries 2: World in Flames cheats
Comments for this hint