During the failed helicopter extraction at 0:33 the team uses a couple of great techniques to make them more visible to the inbound helicopter crew. They attach "chem-lites" to their gear and with one attached to a length of chord, twirl the chem-lite into what is referred to as a "buzz-saw". The only problem - they use green chem-lites which are virtually invisible to night vision goggles the aircrews would be using. True buzz-saws and other markings are done with either red or infrared (IR) chem-lites which are very pronounced under NVGs and harder (red) or impossible(IR) to see with the naked eye.
In the beginning of the movie Benjamin Keyes is introduced as Agent Keyes. Members of the CIA are called intelligence officers, an agent is someone hired or recruited from the outside.