Marines with Echo Company 2nd Battalion 6th marines return from conducting fast rope training in support of Marine Aviation Weapons and Tactics Squadron 1 during the semiannual Weapons and Tactics Instructor Course 2-17, at Auxiliary Airfield II, Yuma, Arizona, April 7, 2017. Lasting seven weeks, WTI is a training evolution hosted by MAWTS-1 which provides standardized advanced and tactical training and certification of unit instructor qualifications to support Marine aviation training and readiness. - Marines with Echo Company 2nd Battalion 6th marines return from conducting fast rope training in support of Marine Aviation Weapons and Tactics Squadron 1 during the semiannual Weapons and Tactics Instructor Course 2-17, at Auxiliary Airfield II, Yuma, Arizona, April 7, 2017. Lasting seven weeks, WTI is a training evolution hosted by MAWTS-1 which provides standardized advanced and tactical training and certification of unit instructor qualifications to support Marine aviation training and readiness.