U.S. Marines run through a cloud of dust. U.S. Marines run through a cloud of dust as they practice fast roping from a MH-60S Knight Hawk helicopter during a crisis response exercise in Bahrain on Nov. 5, 2007. Marines attached to 4th Platoon, 2nd Fleet Antiterrorism Security Team are conducting the exercise to enhance response to a host nation's request for assistance during a time of a crisis. SHARE: Download: Full Size (0.02 MB) Credit: VIRIN: 516916-I-JRG70-813.jpg Photo Gallery