As a military veteran I've had nearly three years worth of CLS initial training and recertifications under my belt. During those training sessions I was taught that tourniquets are not last resorts for controlling bleeding from extremities and the MARCH system of patient assessment (Massive Bleeding, Airway, Respiration, Circulation, Head Injury/Hypothermia). I am also aware that military trauma treatment methods don't always mesh with civilian trauma treatment methods as what military medics/Corpsmen deal with differs vastly than what civilian paramedics deal with on a day to day basis.
I'm curious as to what EMS doctrine (at levels ranging from the first responder, EMT-B and EMT-Paramedic), so to speak, is regarding tourniquets? The last thing I recall was that tourniquets were viewed as last resort measures when it came to first aid. Admittedly the reference I got that from was a lecture given to me as a student at the National Outdoor Leadership School in Lander, WY in 2005 and shipboard damage control training from 2006-2008 timeframe when I served in the US Navy before I transitioned to the US Army in 2009.
*Hyperlinked thread leads to a discussion I'd started over a year ago regarding the MARCH versus ABC (Airway, Breathing, Circulation) means of assessing patients.