In that case, the plastic horn transducer was removed. Yeah I think your spot on with that patches I have a fixed bale that has faded to a lighter green through the years. Possibly using US gear to blend in but association like that would be high speculation to the helmet. Dating M1 shell and liner - bizarre liner alterations. My Helmet is Vietnam Era helmet and liner, later Woodland Camo cover and a heavy cotton chin strap sewn with a chin cup not seen on Infantry models but Paratrooper and some Naval models. Commercial, non-issue items.
I have the number one thing strung inside the camouflage band….
M1 HELMET LINERS – All We Need To Know
This mount consists of a small pouch with three elastic bands attached. To view this slideshow, click on the first photo to enlarge it and then use the arrow keys to navigate through the presentation. Everything had some type of label, marking or code to give you a clue to when it was made for the department of defense. The Vietnam war was the last major conflict in which this helmet protected our brave military soldiers. This is the single-sided, temperate climate variant. A variant in cotton.