More modern military radios also include band-associated Guard receivers. So, if you're on VHF you have 121.5 as the +G freq, on UHF 243.0.
Can't imagine much worse than having to monitor some company frequency - unless it has SelCal, perhaps.
Back in the old pre-123.45 Oceanic days, I once overheard a long and involved chat between Virgin and ba about "Have you got a Mr. (so-and-so) on board?" This went on for some minutes until they said they had. "Please tell him that Miss (someone-or-other) will meet him in the bar of the Hotel Whatever at 1800."
"Well, he won't be the only one then!"
"I'll be there"
"So will I!"
....came the replies in stereo from everyone else within 100 miles or so!