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.   An F-35B begins its short takeoff from the USS America with an external weapons load.Lockheed Martin While North Korea  feverishly works to perfect intercontinental ballistic missile technology , the US and its allies are putting the finishing touches on the F-35 Joint Strike Fighter that will soon be patrolling the Pacific. Japan and South Korea, the US's principal allies the region, will both deploy over 100 F-35s by 2021,  according to Aviation Week . This follows the US choosing Japan as the site of its first-ever deployment of operational F-35Bs, which are  particularly well-suited  to combat in the Pacific region. The F-35, with its stealth characteristics and ability to improve the performance of the legacy jets it flies with, presents technical challenges that even the world's best air forces can't yet overcome. Against North Korea's rudimentary air force and air defenses, the F-35 would dominate and lead South Korean, Japanese, and US legacy fighter je