I think he was surprised I knew what he was talking about. Not too many folks you meet in a hospital have a clue.
They always knew what they did for us was so damn important. When we met our LRRPs (affectionally known as Lurps) on the trail heading for pickup, we gave them water/rations and if needed a few guys to help them get any WIA to the pickup LZ. Great buncha guys. I can understand his surprise as not that many units had direct dealings with them.