Royal Moroccan air force and U.S. Air Force F-16 Fighting Falcons fly in a formation during Exercise African Lion after air-refueling May 21, 2015. The exercise is an annual, bilateral U.S. and Moroccan sponsored exercise designed to improve interoperability and mutual understanding of each nation's tactics, techniques and procedures. (U.S. Air Force photo by Senior Airman Kate Thornton/Released)

U.S. Air Force Senior Airman Amy Lizauckas, 351st Air Refueling Squadron boom operator from Buffalo, N.Y., reviews KC-135 Stratotanker preflight checklist May 21, 2015, during a preflight inspection on RAF Mildenhall, England. The crew is supporting Exercise African Lion, a U.S. Marine Corps-led exercise that encompasses more than six different nations working together to enhance interoperability. (U.S. Air Force photo by Senior Airman Kate Thornton/Released)

U.S. Air Force Senior Airman Amy Lizauckas, 351st Air Refueling Squadron boom operator from Buffalo, N.Y., returns to a KC-135 Stratotanker flight deck May 21, 2015, after a preflight inspection on RAF Mildenhall, England. The crew is supporting Exercise African Lion, a U.S. Marine Corps-led exercise that encompasses more than six different nations working together to enhance interoperability. (U.S. Air Force photo by Senior Airman Kate Thornton/Released)

A four ship F-16 Fighting Falcon formation from Spangdahlem Air Base, Germany, flies behind a KC-135 Stratotanker assigned to RAF Mildenhall, England, while participating in Exercise African Lion May 18, 2015. The exercise features first-time integrated flying operations training and is the largest Department of Defense exercise in Africa (U.S. Air Force photo by Senior Airman Victoria H. Taylor/Released)

A Royal Moroccan air force F-16 receives fuel from a KC-135 Stratotanker assigned to RAF Mildenhall, England, while participating in Exercise African Lion May 18, 2015, the exercise features first-time integrated flying operations training. African Lion is the largest Department of Defense exercise in Africa, with a vision to maximize interoperability between militaries. (U.S. Air Force photo by Senior Airman Victoria H. Taylor/Released)

U.S. Air Force Senior Airman Amy Lizauckas, 351st Air Refueling Squadron boom operator from Buffalo, N.Y., refuels Moroccan air force and U.S. Air Force F-16 Fighting Falcons May 21, 2015, during Exercise African Lion. The U.S. Marine Corps-led exercise encompasses more than six different nations working together to enhance interoperability. (U.S. Air Force photo by Senior Airman Kate Thornton/Released)

A Royal Moroccan air force F-16 Fighting Falcon releases after receiving fuel from a KC-135 Stratotanker assigned to RAF Mildenhall, England, while participating in Exercise African Lion May 18, 2015. The exercise features first-time integrated flying operations training and is the largest Department of Defense exercise in Africa (U.S. Air Force photo by Senior Airman Victoria H. Taylor/Released)

A four ship F-16 Fighting Falcon formation from Spangdahlem Air Base, Germany, flies behind a KC-135 Stratotanker assigned to RAF Mildenhall, England, while participating in Exercise African Lion May 18, 2015. The exercise features first-time integrated flying operations training and is the largest Department of Defense exercise in Africa. (U.S. Air Force photo by Senior Airman Victoria H. Taylor/Released)

An F-16 Fighting Falcon from Spangdahlem Air Base, Germany, receives fuel from a KC-135 Stratotanker assigned to RAF Mildenhall, England, while flying in Exercise African Lion May 21, 2015. The exercise features first-time integrated flying operations training and is the largest Department of Defense exercise on the continent. (U.S. Air Force photo by Senior Airman Kate Thornton/Released)

An F-16 Fighting Falcon from Spangdahlem Air Base, Germany, releases after receiving fuel from a KC-135 Stratotanker assigned to RAF Mildenhall, England, while participating in Exercise African Lion May 15, 2015. The U.S. Marine Corps-led exercise encompasses more than six different nations working together to enhance interoperability. (U.S. Air Force photo by Senior Airman Victoria H. Taylor/Released)

The reflection of an F-16 Fighting Falcon from Spangdahlem Air Base, Germany, appears in the eye of U.S. Air Force Senior Airman Amy Lizauckas, 351st Air Refueling Squadron boom operator from Buffalo, N.Y., during Exercise African Lion May 21, 2015. The annual exercise between the U.S. and the Kingdom of Morocco involves more than 2,500 personnel training to improve interoperability and mutual understanding of each nation's tactics, techniques and procedures. (U.S. Air Force photo by Senior Airman Kate Thornton/Released)

Two Royal Moroccan air force F-16 Fighting Falcons fly alongside the wing of a KC-135 Stratotanker assigned to RAF Mildenhall, England, while participating in Exercise African Lion May 18, 2015. The exercise features first-time integrated flying operations training and is the largest Department of Defense exercise in Africa (U.S. Air Force photo by Senior Airman Victoria H. Taylor/Released)