U.S. Air Force Global High Frequency Network

The USAF Global High Frequency Radio System (GHFS) is a system of 14 High Frequency (HF) stations around the world.

A system upgrade, SCOPE COMMAND, will allow remote control of these radio assets from Andrews AFB, Maryland.  You may hear a station Identify as Offutt Global but the Operator is in Maryland.  The upgrade is not yet complete.  There are many stations that are still being manned by Radio Operators at the local control site.  The Frequencies listed below are not classified and are listed in several places on the web.

These freqs are in Megahertz (MHz) All in upper sideband (USB) :
4.724
6.712
6.739
8.992
9.025
11.175
11.181
13.200
13.211
15.016