Ammo Prep Air Force Airman 1st Class Tyler Parrish, left, breaks off a strip of 7.62 x 51mm ammunition before participating in M240B machine gun live-fire training at Grezelka range, Joint Base Elmendorf-Richardson, Alaska, Oct. 27, 2016. Parrish is an installation entry controller assigned to the 673rd Security Forces Squadron. Air Force photo by Alejandro Pena SHARE: Download: Full Size (1.52 MB) Tags: Air Force, training, Airmen Credit: Alejandro Pena VIRIN: 161027-F-YH552-009A.JPG Photo Gallery