Partially true

You are right that the marines (at least apone) are wearing Army yellow class A dress rank on their bdus. However the Air Force still uses sleeve rank for enlised people.

Very nice patches

Unlikely but not impossible. The Marines could have absorbed the Army or any number of reasons in the future, thus this is not a nit.

Response to 48753

The Marines could never absorb the Army, as they are a smaller military force with a differing mission. The point of the nitpick is why would the Marines in the future be wearing colored Army rank chevrons on their battle dress uniforms when colored rank patches and rank patches have been removed the Army's and Marine's battle dress uniforms in the present day. The military branches removed the patches for tactically valid reasons, such as the fact that the color gave away a soldier's position to the enemy. The militay isn't going to revert back to a methodology that is unsound and puts their personnel at risk, thus the nitpick is valid. Additionally, your mere assertion of "any number of reasons" is too overly broad and vague to refute the nitpick. "Any number of reasons" could refute just about every nitpick on this site.

Response to 48854

And you are assuming the command, structure and uniforms of a fictional branch of the military. Since the Colonial Marines doesn't exist, they could have adopted any uniform type they wanted to.

Please read the FAQ

According to the FAQ for this site, nitpicks are not proper patches on police or military uniforms. Therefore, this is not a nitpick by definition. Additionally, just because the U.S. military does not wear sleeve rank patches today does not mean that they won't adopt them in the future.

In agreement with 48879

While the original poster is correct, this film takes place sometime in the 22nd Century and the United States COLONIAL Marines do not exist today.