MUTT was an acronym like HMMV for the Hummer. I always referred to 151's as jeeps and never heard anyone refer to them as anything else.

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The M151, Turuck, Utility 1/4 ton 4x4 was referred to as a military utility tactical truck in common lingo in the service.... See the first sentence in this pub

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The problem was that Willys Overland trademarked the word jeep after World War Two, despite the fast that they were also built by Ford, and despite the fact that jeep was a common slang term (companies can actually lose their trademark if it becomes a slang term for a class of products, which is why Caterpillar and Kleenex run ads in writers' journals reminding authors not to use those terms unless they mean a specific product). The M151 was a Ford design (though most ended up being built by other companies), and it couldn't legally be called a Jeep, so somebody at Ford or the Pentagon came up with MUTT. Nevertheless, throughout the years they were in service, troops always called them jeeps, to the chagrin of Ford and Jeep Corporation.

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The M151, Turuck, Utility 1/4 ton 4x4 was referred to as a military utility tactical truck in common lingo in the service.... See the first sentence in this pub

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The problem was that Willys Overland trademarked the word jeep after World War Two, despite the fast that they were also built by Ford, and despite the fact that jeep was a common slang term (companies can actually lose their trademark if it becomes a slang term for a class of products, which is why Caterpillar and Kleenex run ads in writers' journals reminding authors not to use those terms unless they mean a specific product). The M151 was a Ford design (though most ended up being built by other companies), and it couldn't legally be called a Jeep, so somebody at Ford or the Pentagon came up with MUTT. Nevertheless, throughout the years they were in service, troops always called them jeeps, to the chagrin of Ford and Jeep Corporation.

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I had 62 M151A2s in my Smoke Generator company in 1982-84. Each had an M60 pedestal mount, and many were modified to carry a Smoke Generator in place of the back seat over a 2 1/2 ton truck fuel tank. We never referred to them as anything other than a "quarter ton". No one would have quickly understood the term "Mutt", and a "Jeep" was either something our fathers had in WWII or Korea, or something civilians drove. Everyone knew what a "quarter ton" was though, just like a "deuce and a half" or a "five ton".
VR Russ

I can remember calling a lot of vehicles by their capacity. For instance the Jeep Pickup based 1 1/4 ton truck was called a five quarter a jeep was often a jeep or quarter ton, then deuce and a half or five ton. In fact about the only wheeled vehicle that I can recall NOT being referred to by weight was the M561 Gama Goat, they were always just Goats.

Best selling truck for a reason.

Actually, as spoons says, MUTT is a made-up name not used officially by the military at all. It is and has always been called a jeep or 1/4 ton.

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I can remember calling a lot of vehicles by their capacity. For instance the Jeep Pickup based 1 1/4 ton truck was called a five quarter a jeep was often a jeep or quarter ton, then deuce and a half or five ton. In fact about the only wheeled vehicle that I can recall NOT being referred to by weight was the M561 Gama Goat, they were always just Goats.

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Yes. I remember the "Goat" well-- another piece of VOLAR army junk. We also had a few 5 quarter tons in the CAV in 1977, but they were on the way out, to be replaced by the CUCV in the 80s-- remember that one? fancy name for a militarized GMC P/U. My 1SG, Troop CDR, the S4,and S3 were all Vietnam vets-- never did I hear them call the 1/4 ton a "Jeep". When I had my Smoke Generator Company, my 1SG was a Vietnam Vet, as were many of the senior NCO's and commanders, but all I heard them say was "1/4 ton". I just can't recall anyone referring to the M151A1 or A2 as anything but a "1/4 ton". I suppose they did in passing on occasion, but "Jeep" was really a bygone term by the late 70s. The previous M38 though was always referred to as a "Jeep", but they were all gone by the time I came in the Army in 1975.
VR, Russ

just so we could get it operational to turn it in because they were dropped form our TO&E. VR Russ

Canadian Army had some in Vietnam as part of ICCS circa 1973.