A victim of blunt abdominal trauma has splenic and liver lacerations as well as an unstable pelvic fracture. He is hypotensive and tachycardic with a hea rate of 150 despite receiving 2 L of crystalloid en route to the hospital. He was intubated prior to arrival due to declining mental status. He is taken emergently to the operating room for exploratory laparotomy and external fixation of his pelvic fracture. Which of the following is the best resuscitative strategy?