If you don't know Martin Litton or his work, it is worth a look on the Google Machine. The tributes are quite moving. If you've ever seen a Colorado River documentary, you'll probably recall his iconic beard:
I only know him through his work to protect and defend the Southwest and West. His life and legacy spawned a new generation of fighters, but more are needed to hold the ground he gained and to beat back the ongoing march of the Bureau of the Wrecked and other Destroyers of the Earth.
For those who had the privilege to know him, it must be a great personal loss. My condolences.