Owinawa, Japan. 26th Apr, 2017. U.S. Marine Corps Sgt. Mark Alvarez, mans the door gun on a UH-1Y Huey helicopter, as they fly in a formation during a Mission Rehearsal Exercise April 26, 2017 in Okinawa, Japan. U.S. Forces across the Asian region have increased combat exercises as tensions continue to rise between the U.S. and North Korea. Credit: Planetpix/Alamy Live News

- Image ID: HYWD7X

Owinawa, Japan. 26th Apr, 2017. U.S. Marine Corps Sgt. Mark Alvarez, mans the door gun on a UH-1Y Huey helicopter, as they fly in a formation during a Mission Rehearsal Exercise April 26, 2017 in Okinawa, Japan. U.S. Forces across the Asian region have increased combat exercises as tensions continue to rise between the U.S. and North Korea. Credit: Planetpix/Alamy Live News

US Marines Photo / Alamy Stock Photo

Image ID: HYWD7X

Location: Okinawa, Japan