Yeah, as its a mod they decided to alter the colour of the game to 1) make it look different to ArmA's usually lush colour scheme and 2) to give it a Band of Brothers feel.
Here's one or two from New vegas. Note the Badass Remnant Armor also that Pulse Rifle is no ordinary little puppy neither. It's a Multiplas Rifle and fires 3xDamage of normal pulse weapons. As for mods: I'm running the 'Detailed Normals' mod which gives the ground, rocks and certain surfaces better textures. A freeplay mod. So I can carry on playing after all is done in the main quest. Level-cap removal mod. For obvious reasons...