I guess one could quibble about the difference between "revoke" and "suspend", but yes, they did at least for WW2. On December 8, 1941, the FCC issued Order Nu

I guess one could quibble about the difference between "revoke" and "suspend", but yes, they did at least for WW2. On December 8, 1941, the FCC issued Order Number 87, which read in part: "Whereas a state of War exists between the United States and the Imperial Japanese government, and the withdrawal from private use of all amateur frequencies is required for the purpose of National Defense; IT IS ORDERED, that except as may hereafter be specifically authorized by the Commission, no person shall engage in any amateur radio operation...and all frequencies heretofore allocated to amateur radio stations under Part 12 of the Rules and Regulations ARE HEREBY WITHDRAWN. All amateur licensees are hereby notified that the Commission has ordered the immediate suspension of all amateur radio operation in the continental U.S., its territories and possessions." http://www.vpnavy01.com/websites/ke3w/history.html#24 http://www.vpnavy01.com/websites/ke3w/history.html#24