Maj. Gen. Hoo Cher Mou, chief of the Republic of Singapore air force, receives a patch from Col. Larry Riddick, 811th Operations Group commander, on Joint Base Andrews, Md., Oct. 20, 2014. Mou was given an aerial tour of Washington from the 811th OG's 1st Helicopter Squadron. Mou is visiting U.S. Air Force key programs and receiving briefings from Air Force leaders as a means to strengthen the coalition relationship. (U.S. Air Force photo/Airman 1st Class Ryan J. Sonnier/Released)