Okay, so, we have pictures now. Bear in mind, these are very large pictures, but the important bits are small, faded, and blurry.
The three key things I'm trying to get from these pictures are the following:
One, what is the breast badge on his right shirt pocket.
Two, what is the unit insignia on his left shoulder.
Three, although probably redundant, what is the flash on the beret. Its probably just the DUI for the unit, but gods know.
First photograph is a color shot from a series of photos, with a great shot of the beret flash. Notice a certain look of satisfaction and affection on his face for the M79.
Next we have a rather critical look at a particular shell, with a decent shot of the breast badge, whatever it may be.
Next is another full-color shot of Grandpa kneeling. Its not the best, but it may help someone who knows what to look for on the breast badge.
Last is a MASSIVE full-color shot of Grandpa with his jeep. This is a great photo for the beret flash, and the shoulder insignia.
So, does anyone have any guesses? My own skills are coming up pretty short in this section, although some interesting discoveries have been made in light of recent photographs.
Chief among them is the knowledge that Grandpa got a CIB in Vietnam while part of 1st Logistical Command, then got assigned to 1st Armored Division (Old Ironsides) which was in Germany at the time, and then transferred back and finished his career in Vietnam in a different unit, retiring at E-8 after 3 tours. He was already a decorated combat veteran at Specialist after 6-8 years, when he was in 1st Armored.
In short, Grandpa is a badass.