aren't they the first version of the patch? they were black on camo pattern first when they were just referred as Xingkong camouflage, then the type 21 uniform came out and they moved on to the yellow on brown patch we see nowI believe these are either marines or naval special forces. The soldier on the right wears a different low-visibility patch design that has a light background with dark texts. Not sure if this design is experimental. The patch worn by the soldier in the middle is the standard design.
These are some of the first pictures we see on the internet when type 21 isn't a thing yet
and some higher resolution pictures that I believe is quite recent
and I found a website in the way that explains difference in iterations of the type 21 uniform if any of us is interested
and that is one weird mag for the dude in the left