The aerobatic demonstration team of the Spanish Air Force, Patrulla Aguila, perform during the 2018 International Torre del Mar Airshow on July 29, 2018. (Jorge Guerrero/AFP via Getty Images)
Russian warships and submarines take part in the Navy Day celebrations in Sevastopol, Crimea, on July 29, 2018. (STR/AFP via Getty Images)
A CH-47 Chinook airdrops an interior bridge bay during River Assault 2018 on the Arkansas River near Fort Smith, Ark., July 25, 2018. The annual exercise brought together Marine Corps and Army units for one of the largest Army Reserve engineer exercises in the country. (Sgt. 1st Class Scott Raymond/Kentucky National Guard)
People watch Russian military helicopters flying above the Gulf of Finland during the Navy Day parade at Kronshtadt near Saint Petersburg on July 29, 2018. (Olga Maltseva/AFP via Getty Images)
People look at nuclear submarine Orel participating in the Navy Day parade at Kronshtadt near Saint Petersburg on July 29, 2018. (Olga Maltseva/AFP via Getty Images)
Prince Charles, Prince of Wales climbs sits in the cockpit of an F-35 fighter jet during a visit to 617 Squadron, the U.K.'s first F-35 Lightning Squadron based at RAF Marham on July 27, 2018, in Marham near Kings Lynn, Norfolk, England. (Chris Radburn/Getty Images)
A bottlenose dolphin in the U.S. Navy Marine Mammal Program, part of the MK 7 Marine Mammal System, places a marking device in the vicinity of an exercise sea mine in Southern California during the 2018 Rim of the Pacific exercise on July 18, 2018. (U.S. Navy)
Sgt. 1st Class Timothy Phillips, senior instructor and writer with Regional Training Site-Maintenance, drives an M88A1 Medium-Tracked Recovery Vehicle during operations for the Tracked Vehicle Recovery Course on July 19, 2018, at a training area on North Post at Fort McCoy, Wis. (Scott T. Sturkol/U.S. Army)
Environmental activists drop off old battle tanks provided by the Lebanese Armed Forces into the Mediterranean Sea, about 3 kilometers off the coast of the southern Lebanese port city of Sidon on July 28, 2018, to create new habitat for marine life. (Mahmoud Zayyat/AFP via Getty Images)