Stairway Check Marines climb a staircase while looking for threats during Island Viper at Marine Corps Base Hawaii, Sept. 28, 2016. During the annual predeployment training event, Marines practice clearing buildings, patrolling through simulated villages, completing obstacles and traversing through an improvised explosive device course. Marine Corps Photo by Cpl. Aaron S. Patterson SHARE: Download: Full Size (1.46 MB) Credit: Cpl. Aaron Patterson VIRIN: 160928-M-QH615-262A.JPG Photo Gallery