From the 23 May '69 1/35 Daily Journals:

0946 hours (U) DELAYED ENTRY - On 23 May 69 at 0940 hours B Co to TOC: B Co's 86 element found remains of downed chopper at grid ZA064245, tail #16583 looks like it had already been stripped and it is a slick

It there a way to identify which unit this helicopter was from using the tail number?

Dave Fogg