Help identifying an army cap

[hatguy11]

Hey guys,
So, I found this hat and I am a little confused as to which military branch it's from.
The insignia is for an army enlisted man (right?) but I thought that army visors were brown and the marines were black in the 1940's. Anyone out there who can clarify this for me?

[Sunray]

I'm seeing that U.S. Army OR's didn't have a forage cap after 1942. The hat is Army. Might be an officer's hat somebody stuck an OR's badge on.
I think the cap badge may be Viet Nam era.
Rummage around here. Caps, Service, Wool, Serge, Olive-Drab (Specifications QMC 8-5D Caps, Service, Wool, Serge, Olive-Drab, Aviation Cadet (Specification QMC 8-5E Dated 12 December 1934).

[hatguy11]

Thanks for the help. That's a really cool website.

[Sunray]

Hi. It's kind of amazing the stuff that's on-line. Lotta really nice people spend a great deal of their time on web sites and get little or no recognition.

[old tanker]

The enlisted service cap device dates to 1917. Also presently worn on the campaign hat by Army drill sergeants.

https://history.army.mil/html/museum..._Tradition.pdf