Jens Hammer u2014 known by his Ranger nickname "Rex Nanorum" u2014 is an Alaskan expatriate and combat veteran who completed five tours in Afghanistan and Iraq with the 2nd Battalion, 75th Ranger Regiment. Since leaving the Army he has worked as a certified helicopter pilot instructor, salvage diver, and commercial fisherman, and now writes firearms and gear reviews for Gun University as well as AmmoLand, The Truth About Guns, and Pew Pew Tactical.
