Col. Larry Riddick, 811th Operations Group commander, welcomes Maj. Gen. Hoo Cher Mou, Chief of the Republic of Singapore Air Force, to Joint Base Andrews, Md., Oct. 20, 2014. Mou is visiting U.S. Air Force key programs and receiving briefings from Air Force leaders as a mean to strengthen the coalition relationship. (U.S. Air Force photo/Airman 1st Class Ryan J. Sonnier)