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.
A Grave Concern 
Yes, My Uncle was in the Navy and a good and charitable man. If you are looking into the family you will find devotion to the Catholic Church through out their lives. To find prayer is a testament to the lives they lead.
Carolyn, we must be related. My Grandmother’s father was William Tennes, brother of Mont. -Kathy Anderson