
As Grady recalls in "Boocoo Dinky Dow,: My short, crazy Vietnam War," he found his on a dusty parade field in Dak To.
"Bleached by the sun from green to tan, it had a narrower brim than the newer bush hats. It would definitely give its wearer that old-timer look, and I was pleased to find that it fit my big head.
"The baseball-style cap I’d been wearing was scorned by many of the infantrymen, who associated it with training. But I had creased its bill and roughed it up to make it look reasonably veteran-ish—enough so that Johnson, who had lost his hat during guard duty the night before, was delighted when I passed it along to him."

"The boonie hat was given to me by a former O'Dea High School classmate, Tim Crowder, who went to Vietnam as a Marine in 1966. He told me that he won it for taking 2nd Place in the Da Nang Surfing Championships. The fluorescent pink material inside the hat is a piece of an aircraft signalling panel. When the hat is turned with the panel pointed upward, you can pop it open and closed and it becomes a visible signal so that an aircraft can spot your location."
The back of the hat is trimmed with luminous tape called following tabs, Ray added.
"They glow in the dark, so that the person behind you can follow you silently without losing track of you and breaking silence by calling for you. It's all pretty much Ranger protocol, and most of the people in the line units didn't do this kind of stuff."
Vets like Ray are delighted by the detailed descriptions Grady put into his memoir. The hats, the knives, the ham-and-lima-bean meals remind them of their time of intensive living in Vietnam -- which, along with its profound miseries, had traditions and habits they will never forget.