You know that bleeding to death from extremity wounds is the number one cause of preventable death on the battlefield and you want to ensure that your Buddy survives What is the first course of action?

Assess the situation and possibly return fire. if it is safe enough to do so, apply the proper pressure dressing or a tourniquet. Save the small stuff for later, as this is what modern miracle drugs like antibiotics are for. Remember: M.A.R.C.H.