Not everything is a taught thing (but was indeed a shall we say, a suggested thing) . People do things because it's an accepted thing amongst peers. Most military training/ techniques is based on the experience of the previous conflict. When i was in, they were considered a normal part of ones 'personal kit' Can they save your life... yes. WILL they save your life... sometimes yes. If things have moved on from that, fine... things move on. But when i was in, did people use them.... yes. Did i ever need to use one... no. But is that ingrained in me from being told by serious people who's lives could depend on it... yes. Will a chap on the internet, who's done nothing like that convince me otherwise... highly unlikely.