First one is Ian McCollum from ForgottenWeapons.com. He runs a popular YouTube channel on the more esoteric firearms and is a walking encyclopedia on guns.
Second photo is Eric and Chad from Moss Pawn and Gun, better known for their channel Iraqveteran8888 on YouTube (800K subscribers?). Eric is very fond of milsurps and has done a number of videos on them, encouraging me to get the same ones. We cruised the Vegas gun show a bit.
Last photo is Jerry Miculek, speed shooting world record holder and now also an avid YouTuber with a great channel.