Can you wear your Marine unit patch as an Army combat patch if you deployed with the Marines? Policy appears to say no.

you Senior leaders out there in uniform, need to challenge your soldiers to read AR 670-1. I will bet you one paycheck that your soldiers can read and comprehend at least at 10th grade level and some even have college. its pretty much easy to answer and a done deal! HOOAH

Absolutely, there should be no issues with former Marines (potentially with more or "real" combat experience) wearing a MARDIV combat patch. As opposed to what, a "naked" right shoulder? What "leader" would want to demean their newly converted "green to green" soldiers in such a dramatic way. It smacks of organizational prejudice! And i do mean "prejudice" in the most negative sense of the word!

I didn't know Marines had a unit patch, but I think they should be allowed to if they deployed with a unit.

There are worse things than a former Marine wearing a combat patch of their former unit in an army uniform. As a former Marine myself, I considered doing it. Anyway, we had a Black hawk pilot in our unit on our first Afghan tour. This was Dec 2002 - August 2003. We used to rotate a crew to Orgun-e as a QRF. This one guy was there for maybe 2 weeks and flew a resupply mission for some SF guys. Somehow, he conned that unit into cutting him orders to wear an SF combat patch, and he wore the thing. Complete glory hound. He was a PAC clerk at 75th Ranger Regiment, but he was sure sporting the Ranger tab. As usually happens with idiots like this, he crashed a helicopter due to poor decision making and human error (no fatalities) and lost his wings a few years later. Me, I wore a combat patch exactly twice: upon return from my last Afghan tour (by direct order) and my retirement. Both times, it was an 82nd patch, the unit I was in for most of my Army life.

You joined the Army, so wear your Army shit. Don't try and mix and match uniforms.

My DI was in Vietnam as a Marine. Wore his Marine patch on left shoulder proudly as a Army Staff Sargent.

I am in the bloody bucket, (also authorized the big red 1 and 3rd ID as combat patches). I personally know several of these soldiers that served under a marine command in Falujia. They earned the right to wear it, AND were given permission to wear it as a combat patch.

Before I retired, in 2013, I wore the Marine Corps 1st MEF. The reason, is the Army, selected me to be on a MITT team, before units started setting up their own. I was assigned in Fallujah, with 11 other guys, we were the only Army team in Fallujah. We reported directly to the Marines, and all of our support came from the Marines, all of our orders, were through the 1st Marine Expeditionary Force. It has nothing to do with Army Pride, but pride in the job that I did, and as a Memorial for one of my Team Mates, Major Michael Mundell, US Army, KIA 5 January 2007, Route Cathy IED.
So before judging people for wearing a Marine patch, why not ask why they wear it.

FUCK NO

If a Army unit (below Bn level) deploys attached to a Marine Regiment or Brigade level command) there should be no problem and anyone who has a problem with it is being trivial.