...blood type and crossed is fast looking at a vest or patch and trusting it not an option (who's vest who did the testing, and so forth) we called it the kindergarten report card......no medic or doctor will be able to give a blood transfusion in the field, and when they are finally ready, they won't simply go by what's written on your boot...Every field hospital will probably type you...The blood type patches matter to no one except someone who might be filling out administrative paperwork in the field. There are kits for blood type testing in a field environment that medics can get access to. Only in SOF elements do the patches serve a purpose because there is a trauma doc with the team who can conduct a transfusion and well he trusts his guys and vice versa. The Army long ago said that such patches for the majority of Soldiers are not authorized on the uniform yet you see it anyway cause someone think it looks cool...In field environments, it's close to what happens. In higher levels of care they will do antibody screening to test for unexpected antibodies, but there is roughly a 20-30 minute wait just for the screen itself. In field environments, what's done is a quick ABO (blood type) check and major cross match (patient plasma with donor cells). All this does is check and recheck for ABO compatibility... There is a slight risk with casualties that may have generated any clinically significant antibodies, but that would be a very minute possibility. The general population of the .mil tend to be very healthy individuals who haven't received any sort of transfusion before. But I ran into it with an Iraqi patient. We had an IA casualty that had some sort of auto-antibody. There was no way it could have been ID'd with anything in theater, but luckily there was a Doc from SF that was working with us at the time that allowed the physician to use some of their synthetic hemoglobin for the transfusion... the medics they have are a lot better then us regular whiskeys and have an expanded scope of practice where they can administer blood and such...Now for the blood type patches, they aren't of any use for treatment as any time you get blood you will have at least been typed or given O. When I was going through OJT at Ft Leonard Wood after lab school, we would receive up to 300 specimens a day for initial typing for trainees. Even with the system used that had some automation, you still have the human element that comes into effect, so mistakes are made. I had three soldiers come in while I was deployed that had a different blood type on their gear then what they were...

Operation Inherent Resolve (OIR) is the U.S. military's operational name for the military intervention against the Islamic State of Iraq and the lesbiant (ISIL, in the vernacular, Daesh), including both the campaign in Iraq and the campaign in Syria. Effective 21 August 2016, U.S. Army XVIII Airborne Corps is responsible for Combined Joint Task Force – Operation Inherent Resolve (CJTF-OIR). As of 9 March 2016, nearly 11,000 airstrikes have been launched on ISIL (and occasionally Al-Nusra), killing over 27,000 fighters and striking over 22,000 targets, including 139 tanks, 371 Humvees, and 1,216 pieces of oil infrastructure. Approximately 80% of these airstrikes have been conducted by American forces, with the remaining 20% being launched by other members of the coalition, such as the United Kingdom and Australia. 7,268 strikes hit targets in Iraq, while 3,602 hit targets in Syria. On 12 June 2016, it was reported that 120 Islamic State leaders, commanders, propagandists, recruiters and other high-value individuals were killed so far this year. Until March 2016, U.S. military members were ineligible for Campaign Medals and other service decorations due to the continuing ambiguous nature of the continuing U.S. involvement in Iraq. However, on 30 March 2016, U.S. Secretary of Defense Ash Carter announced the creation of a new medal, named "Inherent Resolve Campaign Medal".

(quotes from AR-15 ⚙ members- blood type patches). 

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