I read somewhere that the FCC can "take back" frequencies if they are needed elsewhere.
The article was about thousands of garage door openers that no longer work in the Quantico area...the Marines are now using the frequency.
edit: here it is
http://www.boingboing.net/2007/02/27/military-rf-kills-ga.html
Edited 1 time(s). Last edit at 10/08/2007 11:48AM by duh.