I just tuned to 8992Khz at around 05:30 UTC to hear this curiosity, I've read about it before but tonight its active as ever albeit intermittent in 3 to 5 minutes between calls, just heard it again at around 05:44UTC now.
Look for increases of EAMs on 8.992 as well as the other HF Global freqs due to the rising tensions in the Gulf with Isreal positioning nuclear subs off of Iran's coastline. Could get interesting. I would suspect that our military's alert status would increase if it already hasn't.