Fire in the hole

(Click to big up) U.S. Army Soldiers assigned to 1st Battalion, 27th Infantry Regiment, 2nd SBCT, 25th Infantry Division, fire rounds on Rodriguez Live Fire Complex, South Korea, March 22, 2015. U.S. Army Solders run a live-fire exercise during joint training exercise Foal Eagle 2015. (U.S. Army photo by Pfc. Samantha Van Winkle)
The weapon in action is the rarely seen M1128 Mobile Gun System (MGS), a wheeled 8×8 version Stryker vehicle that mounts the M68A1E4 105-mm rifled tank gun, thus making the 18-ton MGS something of a modern day tank destroyer. Of course its too lightly armored (only resistant to small arms rounds) to get in a real armor v. armor engagement unless its with a Panzer I that has time warped from 1939 which means the Stryker would need to slay the offending evil doer’s tank and then rapidly displace.
Plus, they only carry 18 rounds for the main gun and don’t have air conditioning. Nonetheless, these big-gunned armored cars are popular with the ground pounders as they can dish out very effective canister rounds (think a shotgun times 1000) as well as HEAT and HESH shells in a pinch should the bad guy’s surplus T-55 come poking over the hill.
The Army only has 139 of these unicorns.