It was filmed on Oʻahu, Hawaii, with locations including Honolulu, Waikiki, the National Memorial Cemetery of the Pacific, Bellows Beach in Waimanalo, Keehi Lagoon, and the Ala Wai Heliport. The episode title appears to be “Here Today... Gone Tonight” from 1973, which matches Season 6, Episode 10 in the listing I found.

Filming spots

  • National Memorial Cemetery of the Pacific, Honolulu.
  • Sheraton Waikiki Hotel, Honolulu.
  • Ala Wai Heliport, Waikiki, Honolulu.
  • Bellows Beach, Waimanalo, Oʻahu.
  • Keehi Lagoon, Honolulu.

Note on the episode

The season 6 episode review listing aligns that episode with the 1973 broadcast year and season placement. If you want, I can also narrow it down to the exact scene-by-scene locations.