I find it quite amusing when introductions are made around the table at a meeting that has a military connection attended by a mix of mostly civilians, retirees and serving. The serving junior officers tend to introduce themselves as "Flt Lt Bloggs" or "Fg Off Bloggs" etc which often seems like a vain attempt to sound self important (especially when they are already in uniform). I find that senior officers in the same position do not use the rank but Christian and surname. I also find that senior civil servants insist on using just Christian names..it makes things much more approachable.