A Japanese Air Self Defense Force 747 arrives at Joint Base Andrews, Md., April 27, 2015. Shinzō Abe, Japanese Prime Minister, is in the U.S. for a week-long visit to promote stronger military and economic ties. (U.S. Air Force photo/Airman 1st Class Ryan J. Sonnier)

Shinzō Abe, Japanese Prime Minister, and his wife, Akie Abe, arrive at Joint Base Andrews, Md., April 27, 2015. Abe is visiting the U.S. meet with government officials about a new phase in U.S.-Japan relations. (U.S. Air Force photo/Airman 1st Class Ryan J. Sonnier)

Shinzō Abe, Japanese Prime Minister, and his wife, Akie Abe, greet and receive flowers from Glenn Vamvalnburg, Great Falls Elementary School 2nd grader, and Megan Dooley, 4th grade Junior Olympic gymnast, at Joint Base Andrews, Md., April 27, 2015. Abe is in the U.S. for a week-long visit to promote stronger military and economic ties. (U.S. Air Force photo by Senior Master Sgt. Kevin Wallace/RELEASED)

Col. Lawrence Havird, 89th Maintenance Group commander, greets Shinzō Abe, Japanese Prime Minister, at Joint Base Andrews, Md., April 27, 2015. Abe is in the U.S. for a week-long visit to promote stronger military and economic ties. (U.S. Air Force photo by Senior Master Sgt. Kevin Wallace/RELEASED)

Shinzō Abe, Japanese Prime Minister, stands as the Japanese and U.S. National Anthems are played at Joint Base Andrews, Md., April 27, 2015. A Joint Service Color Guard presented the colors of both nations during the Japanese and U.S. National Anthems. (U.S. Air Force photo/Airman 1st Class Ryan J. Sonnier)

Shinzō Abe, Japanese Prime Minister, and his wife, Akie Abe, await ground transportation after arriving at Joint Base Andrews, Md., April 27, 2015. Abe is in the U.S. for a week-long visit to promote stronger military and economic ties. (U.S. Air Force photo/Airman 1st Class Ryan J. Sonnier)