Tactical Hand Signals. Whether you use these or you see them being used, you will know what the next move is.
He'd likely have a black one of these stashed wherever, or something similar. Multi-Purpose 1 day pack ( FirstSpear is a brand created by former U.S. servicemen, they develop enhanced light-weight load carriage solutions for the US Special Forces ) / TechNews24h.com
Best ruck I've owned. I really like my Gregory backpack, but this holds more gear and is much more durable. Plus the MOLLE webbing allows for expansion