My reply to you keeps saying:
Whoops, that's an error.
We apologize for the inconvenience.
Don't know why but here's my response:
These calls are uncommon, but not unprecedented. I typically suspect code word calls to be drills for nuclear forces. HFGCS rarely transmits a code word.
That said, the situation in Turkey and US nuclear weapons at Incirlik Air Force Base leave me suspicious that the last few days of code words have something to do with the safety of the bombs at Incirlik. Only speculation.