U.S. Army CH-47 Chinook helicopters continue a mission after being aerially refueled during Emerald Warrior, Duke Field, Fla., March 6, 2012. The primary purpose of Emerald Warrior is to exercise special operations components in urban and irregular warfare settings to support combatant commanders in theater campaigns. Emerald Warrior leverages lessons from Operation Iraqi Freedom, Operation Enduring Freedom and other historical lessons to provide better trained and ready forces to combatant commanders.

- Image ID: CFCF6P
U.S. Army CH-47 Chinook helicopters continue a mission after being aerially refueled during Emerald Warrior, Duke Field, Fla., March 6, 2012. The primary purpose of Emerald Warrior is to exercise special operations components in urban and irregular warfare settings to support combatant commanders in theater campaigns. Emerald Warrior leverages lessons from Operation Iraqi Freedom, Operation Enduring Freedom and other historical lessons to provide better trained and ready forces to combatant commanders.
508 collection / Alamy Stock Photo
Image ID: CFCF6P
U.S. Army CH-47 Chinook helicopters continue a mission after being aerially refueled during Emerald Warrior, Duke Field, Fla., March 6, 2012. The primary purpose of Emerald Warrior is to exercise special operations components in urban and irregular warfare settings to support combatant commanders in theater campaigns. Emerald Warrior leverages lessons from Operation Iraqi Freedom, Operation Enduring Freedom and other historical lessons to provide better trained and ready forces to combatant commanders.