From my recent MVM article "In February 1970, Kaiser-Jeep was purchased by American Motors Corporation. On March 26, 1970, Kaiser-Jeep became the Jeep Corporation. The South Bend facilities were part of the General Products Division. Just over a year later, on March 31, 1971, the General Products Division of the Jeep Corporation spun off and became AM General, a wholly owned subsidiary of American Motors."
If you can provide the Army registration number (hood, or USA number), I can probably tell you if it was General Products Division or AM General.
Best wishes,
David Doyle