That's Chuck standing up on the 35' Seafox in the top left photo. I took that picture when MARG 2-83 relieved MARG 1-83 in March of 1983 in Beirut. He was the asst. platoon leader of the oncoming SEAL Platoon, probably a LTJG if memory serves.
All of the pictures I could now find on Google images show Chuck to be old, fat and gray. He was a tall, handsome, happy-go-lucky red-headed stud when I knew him. I'm sure I have some good paper photos of him "back in the day" in boxes in my garage, but none that are scanned.
Anyway, Chuck was a great guy and a real live-wire when I knew him in the early 80s. He drew cartoons, and made up team songs. In fact, he drew the current ST-4 logo. (UDT-21 became ST-4 in 1983.) My platoon was the last to ever deploy from UDT-21, and became the first-ever deployed platoon from ST-4 while we were in Beirut.
He even drew the shark teeth on his Seafox. A very creative and happy guy. I lost track of him years ago, but he's had some severe health challenges, and his "SEAL Target Geronimo" book was widely panned as being at least partly BS, but I haven't read it.
Here is the ST-4 logo, drawn by Chuck. It shows a seal pointing a ka-bar knife at Central America, the ST-4 AO. The motto is "Mal Ad Osteo," after the song that was popular then, "Bad to the bone."