Starting a running AFMARS log and see where this goes.
13927 kHz
5 Feb 25
1955z unk aircraft with a SELCAL check
2000z HOBBY42 with a phone patch
2007z MARSRADIO testing SELCAL
2009z brief open mic and MARSRADIO asking if any DoD aircraft needing anything
2038 ROPER55 in Dallas TX with r/c. Southeast 12 answers. Also check of 2nd radio.
2159z LORD JIM with radio check on 5 radios
2317z Aircraft 7035 with a r/c. MARS station out of FL answers
Seems like the word is out to use AFMARS instead of HFGCS for radio checks