This Day in Aviation History

August 24th, 1970
Two USAF Sikorsky HH-53 C helicopters complete a non-stop trans-Pacific crossing from Eglin AFB, Florida to Da Nang, South Vietnam, aided by refueling encounters with Lockheed C-130 tankers.

Wikipedia, Sikorsky MH-53:

YouTube, Pave Low Formation Flight:

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