U.S. Army soldiers assigned to 4th Battalion, 31st Infantry Regiment, 2nd Brigade Combat Team, pull security during squad tactical training conducted as train-up to a cumulative Field Training Exercise during Operation Commando Rattlesnake held March 10-28 on Fort Drum. Rattlesnake was a three week long joint unit exercise allowing the exchange of lessons on training practices, identifying areas of improvement between U.S. and U.K. interoperability, and to validate live, virtual, and constructive integration architecture for the U.S. Army.