I can find no record of 6855 kHz being an active mil freq, but heard what sounds like mil air traffic at 2323z and again at 2357z. Recordings of first message at
https://www.lutins.org/temp/6855_1.mp3 and second message at
https://www.lutins.org/temp/6855_2.mp3. Transcript (best as I can discern) of first message is as follows (M = male; F = female):
M: [Sevine ?] [Sevine ?] Speedair zero one, Speedair zero one
F: Speedair zero one [flight ?] forward go ahead
M: Charlie three five Charlie three five, Golf two three Golf two three, [chest ?] now zero two zero, zero two zero
F: Charlie three five Charlie three five, Golf two three Golf two three, zero two zero, zero two zero
[beep]
M: Roger Roger