I'm just now noticing how sloppy his robot arm sleeve is.

Likely a production issue where the prosthetic just wouldn't fit in the sleeve so they said fuck it and cut it, which is what civilians would do.

But that man is a citizen, and active duty. A) since so many of the military members are missing limbs it stands to reason there would be a standard protocol, even a special shirt issued for members who's limbs no longer fit. And B, presumably, regardless of limb status, torn sleeves have got to be a few lashings.