From the late 1970s until the early 1990s, Lowe Alpine Systems offered a military line of packs called Vector. I owned a Woodland LCS-85 pack which is similar to the LCS-84 seen here, but I had also used an OD LOCO at 3ID LRS. LOCOs are rarely found with the rappelling harness as those were used long after the packs were discarded. These are pages from their catalog from the mid-80s.
“In 1978 in response to their experience in the U.S. Special Forces, Greg and Mike Lowe began designing to the needs of the U.S. Army and Marines as well as search and rescue organizations. Today, based on wide ranging input from outdoorsmen, hunters, rescue groups, SWAT teams and the military, Vector has become the leader in backpack design and innovation.”