Military issue day scopes were fixed 10X in years past due to the increased strength of the fixed power scopes.
Later, as adjustables got much (MUCH!) better, everyone moved to adjustable. Today, to my limited knowledge (and excluding some heavy hitters like 416s, 408s, and 50 cals), no day scopes in military service are fixed 10X scopes.
Various branches are running S&B, Leupold, Premier, Nightforce, and few other (mostly for specialized weapons), everyone has made the jump to adjustables since they are now as rugged (or damn close) and offer a much broader range of capabilities.
In my opinion, there is no reason (other than building a replica) to buy a fixed 10X in that price range.