When examining period chevrons you will notice that there are differences in their manufacture. Below are pictured three difference chevron types all on a group of uniforms belonging to the same Technician 3rd Grade who served in the Pacific Theater and was discharged in 1946.

Olive Drab Wool Stripes on Dark Navy Blue Wool Ike Jacket

Machine Embroidered Olive Drab on Dark Navy Blue Wool Overcoat

Machine Embroidered Khaki on Dark Navy Blue Twill Khaki Shirt