U. S. Army Lt. Col. E. J. Irvin, former commander of the 1-228th Aviation Regiment, salutes a CH-47D Chinook and its crew May 28, 2014 as they depart Soto Cano Air Base, Honduras for the last time. The 1-228th was the last active duty unit in the Army to fly these historic behemoths, which began their service during the 1960’s, before transitioning to the newer CH-47F model. (Photo by U. S. Air National Guard Capt. Steven Stubbs)