I'm didn't used to be overly convinced about all this stuff, but after a few 'experiences' I've had along the way in life, I'm a lot more open minded than I used to be.
Both dits I have about the Service are second hand though I'm afraid. One is from when I was on Spartan, and a cetain Killick WEM claimed to have seen a ghost of some sort walk into the JR's mess when the boat was docked in AFD 60. He had a bit of a drink problem (understatement) but as he was soberish at the time, and his oppo also seen the same, it gets a lot harder to discount.
The other goes back to trade training, when a lad was alone one night in one of the blocks at Sultan. He was on the second floor, doing his laundry, when suddenly his boom box stopped and the room got damned cold. At that point, he turned around, and saw a ghostly figure, very clearly definable, with an old type Nos 1's suit on and a black coloured hat. The figure basically just smiled at him then vanished. Said lad was well shit up for a long time. I give it credance as he was a fairly switched on kiddy, and not given to telling tales or attention seeking in any way. Also, when you talked to him about it, he just seemed to give off the vibe of being straight up, and that counted for a lot with me.
One more thing about the block that happened in (I think it was Rodney block maybe? I was in Hood) was that one mess on the bottom floor was always left locked up and full of old beds and junk, no matter how busy Sultan was, they never, ever seemed to use it. Apparently, people kept feeling unsettled when they stayed in it etc. One night, we were in the block in the mess opposite having a few illicit wets, and at about 3 in the morning, you'd swear you could hear beds shaking/getting scraped along the floor. Maybe imagination, who knows? I dont.
Also, talking of Spartan, there was a cetain Jock Steward who had some real issues with his house in Dumbarton, to the point of actually having to get the Church into have a look around, but I'll leave that dit for him in case he pops up on here. Basically though, he had furniture moving, noises, and even chairs backing up against the doors so when he and the wife would go out, they couldn't get back in again!
I had a few experiences in later life when I bought my first home, but not exactly 'Jack' related, so I'll leave those out. They did make me more ready to accept that there may be some things we cant comprehend.