This happen at one of the unit, 21st Singapore Artillery.

If you are having duty. Do not go down to the armory late at night. The one at HQ Battery. A duty personnel saw something float in on the CCTV during his night shift.

I was doing COS duty then at night. I was waiting for DO to clear the armskote in HQ battery. I heard boots sound of someone running down the steps to the basement where the armory was and it sounded louder and louder. Then suddenly no sound and I did not see anyone go pass my armory. I peeked out both sides and see that all the stores closed. So i just assumed that person (if it's a person) run out of the building rather than towards my armory after coming to the basement.