Solved it! (i think?)
Wiki's current article: "By the mid-1970s, some of the male band members who had been eligible to be drafted to Vietnam were avoiding living in the U.S., so the band relocated to Vancouver, British Columbia, Canada.[3]"
http://en.wikipedia.org/wiki/Heart_(band)#Success_.281975.E2.80.931982.29
From Wiki's referenced source (jam.canoe): "With Nancy Wilson's addition following completion of College in 1974, the band was re-christened Heart and moved to Vancouver, British Columbia after manager Mike Fisher [or 'Flicker'?] found out he was to be drafted by the United States Army."
http://jam.canoe.ca/Music/Pop_Encyclopedia/H/Heart.html
***Mike 'whoever' (Fisher or Flicker) apparently fled to Vancouver in 1971! Not "mid-seventies"...
***"After relocating to Vancouver, British Columbia in 1971, Mike designed and built Mushroom Studios, the premiere state-of-the-art studio in western Canada."
...
"There is a theory, but as yet no supporting evidence, that after brothers Mike and Roger Fisher and Steve Fossen formed 'The Army' in 1963 in Seattle, Mike Fisher moved to L.A. and changed his name to Mike Flicker. As the Zoo album is dated 1967, Fisher would have been aged 15 or younger when he did this."
...
"The Wilson sisters grew up in Southern California and Taiwan before their Marine Corps father retired to the Seattle suburbs. After attending college, they returned to Seattle with Nancy working as a folk singer and Ann joining a hitherto-all-male local group in 1970. This group had been formed in 1963 by Steve Fossen and Roger and Mike Fisher as 'Army'. They later changed their name to 'Heart' briefly[citation needed], then became 'White Heart' (or perhaps 'White Hart'). When Ann joined, she became Mike Fisher's girlfriend. The group went under the name 'Hocus Pocus' in the early 70's before going back to 'White Heart', and then shortening that to "Heart" by the time Nancy joined in 1974. Nancy soon became involved with Fisher's brother, lead guitarist Roger. In 1974 the Heart lineup consisted of Ann, Nancy, Roger Fisher, Steve Fossen (bass), John Hannah (keyboards) and Brian Johnstone (drums).[citation needed]
The original band was called 'Army', (without the 'The'), and they played for several years in and around the Bothell, Washington area (north and east of Seattle)." http://en.wikipedia.org/wiki/Mike_Flicker#Early_career
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Any volunteers to take up the fact searching on this?? I've got a freakin headache!
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Ping to post #74.