I have a bunch of these chevrons, but I never could figure out where/when they were worn. Well, last night I was reading through "United States Marine Corps Grade Insignia Since 1775" by Perrenot, and found this on p135:
"In 1952, a series of regulations concerning Woman Marine uniforms were published that smartened up the apperance of the uniforms. [...] The winter service uniform was changed so that Woman Marines wore a gray-green blouse under it instead of a khaki shirt and forest green on gray-green chevrons were made for this shirt."
And on the following page, he states the gray-green shirt was abolished in 1975.
Now at least I had something to go on, and I found a couple of pictures in the National Archive. First, there is this one, showing a flag raising at Quantico in 1969. If you look closely at the LCpl walking off to the left, you can see that she is wearing the gray-green shirt, not a khaki one.
Edited by jasonc, 21 August 2016 - 03:19 PM.