This marker was actually the first one in the Tennes family plot that I paused to look at.
On it are lines from a famous poem by John Gillespie Magee, Jr., an American who penned the piece “High Flight” while serving in the Canadian Air Force during World War II. Magee perished in a plane collision at the end of 1941, but his poem has lived on and become a favorite of aviators and astronauts. I was able to find an online obituary for Horace Tennes confirming that he was a naval Lt. Commander in World War II, commanding a bombing squadron.