She was not glamorous. She was not fast. She never launched a torpedo in anger. And yet, USS R-9 (SS-86) served her country with quiet persistence from the close of World War I through the climactic end of World War II. Her name is seldom heard outside the circles of Navy archives and submarine veterans, but her legacy endures in the simple, steadfast performance of her duty.

Laid down on March 6, 1918, and launched into the waters off Quincy, Massachusetts, on May 24, 1919, R-9 came into the world just a little too late for the war that had inspired her. She was part of the R-class submarines, a new breed of coastal defense boats designed to guard America’s shores in an age when undersea warfare was still finding its footing. These boats were no-frills workhorses. With four 21-inch torpedo tubes and a 3-inch deck gun, R-9 was not built to win glory. She was built to keep watch.