They could be. When I was a lineman in the Army we wore gloves like those. The newer issue gloves are close to that but don't have the wide wrist area. For $1 I'd use them because they are great working gloves.
Unless there is a stamp somewhere on them indicating they are, they probably are just work gloves. Most military issue I have seen will have such a stamp and usually an ID number such as "US Army M4s14" etc. just for example. Monty