Stumbled onto this document from the New South Wales Institute of Trauma and Injury Management:
In Vietnam we treated hypovolemia with copious amounts of crystalloid. It appears that the lessons learned from Iraq and Afghanistan are that we should be treating blood loss with RBC:FFP:Platelets in a 1:1:1 ratio.
Section 5.2 of the above document give a good overview of “repleating intravascular volume.”
The current thinking, at least in New South Wales, is that (in the absence of TBI, aka traumatic brain injury) lower blood pressures should be tolerated and crystalloid/colloid minimized. This lessens dilution of coagulation factors and promotes clot formation. Resuscitation fluid should be RBC, FFP, and platelets. Preferably in a ration of 1:1:1.