You are spot on. These stamps are from the 1970s. I have found Peru in 76, Venezuela, Entrada in 75, Venezuela, Salida in 75, Rio in 77, Salida in 76, Venezula in 76 from the Consulado stamped in a 30 day turista , Columbia in 76, France in 71, Argentina in 76 with a 64 inspector, Venezuela in 76, Panama ,Salida, and Tocumen in 75, Brasil in 75, Venezuela in 74, Brazil again in 75, Venezuela again in 74 at Maiqoetia, Nubia in 70 and someplace that only stamps in Arabic in 1977. It looks like he loved his South America visits. My family tells me that he ran over a land mine and was in a comma for two months. I don't see that on his DD214. I wished I had talked to him more when he was alive. I did not know he was a world traveler. We went deer hunting one year, but I think he got bored. No wonder.
Jim