Welcome to BF. Ex-Navy myself, black shoe.

My most significant accident involved a concussion and I also had no recollection of going down nor the few instants beforehand - just woke up on the side of the road wondering what happened. Not even sure if I was out a few seconds or a couple of minutes. Next day my doc told me that the memory loss is very common.

Winter is my time for more accidents - wet leaves and mossy roads have been known to take me down, but I must be lucky as I have fewer accidents than 1 every 4K miles.