Originally built as a bomber airfield, RAF Ossington opened as part of 5 Group, Bomber Command but was transferred to Flying Training Command shortly after it opened in January 1942. The first unit to occupy the site was 14 (P) AFU with its Airspeed Oxfords, who moved in on January 19th 1942 and stayed until transferring to Banff, Scotland in May 1943. The airfield was transferred back to Bomber Command under 93 (OTU) Group with RAF Gamston as its satellite. Ossington's next unit, 82 OTU, was formed from 28 OTU Wymeswold in June 1943, whose Wellingtons temporarily used Ossington whilst work was being undertaken there. A mixture of Wellington IIIs and Wellington Xs could be seen and operated in support of Bomber Command operations, as did many OTUs, on many of the leafleting raids (nickelling) as a preparation to operational life.
Overheard in the officer's mess, RAF Ossington, 1943...
"I say Roger, there's a jolly fine new WAAF standing outside the BOU"
"Yes, I believe she's a new bus driver"
"Really? That's duff gen for sure. Girls do not fly crates, specially not like ours.
I heard she used to be the cypher queen at SIC."
"Must be here for the big show. Atomic whatnot."
"Walls have ears Rog, you know. Keep your voice down. Anyway, we get these periodic rumours and I never believe a word."
"Hmm. Well, lots of toys have been delivered. And tables. Believe what you like. The S/L is in a hell of a flap about something."
"What's her name, anyway Rog?"
"How would I know? Never seen her. Helen. Can't be more than four foot six, but perfectly operational."
"Ah, I see you you do know a bit about her! No wonder you're still second dickey. If you spent more time on FT than stooging about the women you might do better, old chap".
"I don't need more FT, you think I need to learn how to snake about like the Glamour Boys?"
"Keep your hair on, Rog. Talking of snaking about, I saw you weaving an uneven course for home last night and I wouldn't be surprised if there wasn't some bit of fluff in the pub, what?"
"Less said the better, Ginger. I'll admit to a bit of hooching, that's all. Anyway, I'm off to welcome Helen formally to ON. Wonder how she got the job? Must ask the Harbour Master. I heard that there were a dozen applicants. He's gone soft since returning from that show with half a wing missing and nothing on the clock except Smiths. No wonder he flies a desk these days. Spends most of his time pickled as a newt, and answers in Morse Code if you ask him anything dicey. God knows what the interviewees think. I'm sure he picks them at random anyway. Bye, enjoy your jankers."
"Roger, Roger!"
Later, Ginger bumps into the Commanding Officer ("Harbour Master") and has a word about the new recruit. After some general chat, the CO is about to reveal how he selects the candidates... but perhaps with a view to confidentiality he talks in Morse when he answers the question.
If you can deduce his selection technique (with help from the clues in the conversation above), perhaps you're bright enough to figure out the cache location. Or are Ginger and Roger merely going to lead you on a merry dance?
You can validate your puzzle solution with certitude.