Document all assessment and care on a DD Form 1380 TCCC card. Every Service member will carry their own DD Form 1380 in their JFAK. If possible, use a permanent marker (such as a Sharpie) to make entries on the card. When rendering care or assisting medical personnel, include as much information as you can on the card.
This is the official record of the care provided and should go with the casualty when care is handed off to a medic or at the time of evacuation.
Communication includes the MIST report and 9-line MEDEVAC request.