"Who goes there" was the motto of the 684th Aircraft Control and Warning Squadron manning the Mt. Lemmon Air Force Station in 1957. The installation, at 9,150-feet, was said to be the world's ...

Speaking of the Lunar and Planetary Lab: You can join the LPL gang for an open house up on Mount Lemmon later ... walking tour of the defunct Air Force Station, hosted by a veteran radar officer.