For what it is worth, I personally own various 6.5-20 MK4s, Nightforces, U.S. Optics, as well as IOR and some lesser scopes.
The older Leupold MK4s were G2G. Today, I would not purchase one.
Dodgefan is correct in that Big Army does not use Leupold exclusively. Not even close.
Leupold a number of years back started to have serious QC issues and many organizations that had purchasing latitude moved away from Leupold to USO and Nightforce and S&B.
As an example, on this issued SR25 below,with a MKIV it was standard practice to dial dope, say 400+3, then 3 extra clicks, then go back three clicks to settle the turret. Simply put, the Leupolds had a habit of tracking poorly. Fact, not opinion. BTDT.