Grenade Toss Army Spc. Alexander Gravely throws a grenade during the situational training exercise at this year's Army National Guard Best Warrior Competition at Camp Navajo Military Reservation, Ariz., July 21, 2021. SHARE: Download: Full Size (3.94 MB) Tags: Army Credit: Army Sgt. Laura Bauer VIRIN: 210721-Z-AA430-088.JPG Photo Gallery