F/A-18 Hornets fly above the Nimitz-class aircraft carrier USS John C. Stennis in the Pacific Ocean. The US Navy has 10 of the 97,000-ton ships, which can carry more than 60 aircraft each.
An F-35B Joint Strike Fighter tests its vertical landing capability in 2015. The fifth-generation jets have been deployed to Marine Corps Air Station Iwakuni in Japan as the US moves some of its most modern equipment to Northeast Asia.
Chinese J-20 stealth fighters perform during the 11th China International Aviation and Aerospace Exhibition, also known as Airshow China 2016, in Zhuhai on November 1, 2016. The J-20 is one of China's answers to US F-22 and F-35 stealth fighters.
Chinese military vehicles carrying DF-26 ballistic missiles participate in a military parade at Tiananmen Square in Beijing in 2015. The missile has been dubbed "the Guam killer" by analysts for their ability to hit the strategic US island in the Pacific.
Korean People's Army (KPA) soldiers march on Kim Il Sung sqaure during a military parade in Pyongyang on April 15, 2017. North Korea trails only China, the US and India in the number of people in the military.
A North Korean tank participates in a competition in this 2017 picture released from North Korea's official Korean Central News Agency. North Korea has 3,500 main battle tanks in its arsenal.
The South Korean Navy's first Aegis destroyer "King Sejong" is seen at the launching ceremony at the Ulsan dockyard of Hyundai Heavy Industries in the southeastern port city of Ulsan in 2007. The 7,600-ton destroyer is considered by analysts to be among the world's most advanced warships.
A South Korean K2 tank (C) moves during an equipment demonstration at the Defense Expo Korea 2016 at KINTEX exhibition hall in Goyang, north of Seoul, on September 10, 2016. The K2, nicknamed the "Black Panther" is considered to be among the world's best tanks.
The Japanese submarine Oyashio, escorted by a Japanese destroyer, arrives at the former US naval base in Subic Bay, Philippines, in April 2016. Submarines are considered a key strength of one of the world's strongest navies.
Japan's Maritime Self-Defense Force helicopter destroyer Izumo takes part in a fleet review off Sagami Bay in October 2015. Helicopter destroyers combine with Japanese subs to give Tokyo exceptional anti-submarine warfare capabilities.