The U.S. military perfected a self-propelled 8-inch howitzer in the early 1960s using the same Detroit Diesel 8V71T-powered double-tracked hull as the M107 175mm gun, only fitted with a short-barreled (25.3 caliber) 203mm M2A2 howitzer. The resulting gun, the M110, was improved in the 1980s with the longer-barreled (43-caliber) M201 203mm gun, complete with a double-baffle muzzle brake, in the follow-on M110A1/A2 variants.
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Replaced by the 270mm MLRS in U.S. service in 1994 following a swan song in the first Gulf War, the Pentagon shopped around the low-round count M110A2s still on hand to assorted customers in the Middle East/Mediterranean in Bahrain, Egypt, Greece, Jordan, Morocco, and Pakistan, most of which still have them.
Also, Taiwan got a boatload, of which 70 are still in front-line service, as seen in this recent moto video from the country’s military, loading their 200-pound shells via hydraulic rammers and blasting them offshore at ranges under 26,000 yards.

8-inch Howie still on Watch
The U.S. military perfected a self-propelled 8-inch howitzer in the early 1960s using the same Detroit Diesel 8V71T-powered double-tracked hull as the M107 175mm gun, only fitted with a short-barre…

Replaced by the 270mm MLRS in U.S. service in 1994 following a swan song in the first Gulf War, the Pentagon shopped around the low-round count M110A2s still on hand to assorted customers in the Middle East/Mediterranean in Bahrain, Egypt, Greece, Jordan, Morocco, and Pakistan, most of which still have them.
Also, Taiwan got a boatload, of which 70 are still in front-line service, as seen in this recent moto video from the country’s military, loading their 200-pound shells via hydraulic rammers and blasting them offshore at ranges under 26,000 yards.