Recently there was some question of where (AFN) AFRTS went from Puerto Rico. It
was on 7507 via Puerto Rico, and now it seems as though Puerto Rico may have
been dropped in favour of Key West on 7812.5 per
http://myafn.dodmedia.osd.mil/radio/shortwave/ (Which may or may not be
factually correct as it seems that Diego Garcia has been inactive for some
time).

7812.5 unheard here at 2015, though I will check later when propagation may be
better.

(Thanks to Glenn Hauser for some info on this, other research by myself).

dxAce
Michigan
USA