you might try the archives of the 33rd Aerospace Rescue and Recovery Squadron
Thanks for the tip!
Based on that clue, I found (and bought online as an ebook) a 642-page book on their exploits, as well as this online database:
SEA SAR Database Project. (South-East Asia Search and Rescue Project).
I've updated my post above to include two new incidents and a second description of an incident I had found before.
I've also added information about the book, which is a 642 page account of combat search and rescue, as well as a photo from April of this year of US troops being instructed in the use of the MIL-M-18371E emergency signaling mirror.