bit of googling turned up a wiki
that credits Richie Furay and Jim Messina with putting Poco together in 1868 after the breakup of Buffalo Springfield.
I don't know much about the Royal Guardsmen, but have been a long time Poco fan, ever since I heard Crazy Eyes in the 70's. even though I thoroughly dislike country, most of the Poco stuff sounds pretty good, with a few notable exceptions. Crazy Eyes, Rose of Cimmaron and Legend are albums I've worn out over the years.
Some of their stuff is excellent, my favorites are always the rockers - Crazy Eyes, Legend, A Right Along, and a few others. Magnolia is one I played at solo gigs for years, a laid back JJ Cale song.
Poco was also one of the first groups to experiment with a slide guitar called a MeloBar. Designed to hang by a guitar strap like any regular guitar, but with an angled neck made to be played like a lap steel. A Right along is the most notable example, that was the song they used it on for a documentary about the instrument in the early 70's, and that was my first exposure to their music. I loved that song at first listen.
Mel O Bar - http://www.gbase.com/gear/smith-mosrite ... 7-sunburst
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If you see me running, better catch up!