After hitting .300 or more in three minor league seasons, Mancuso entered the U.S. Army as a paratrooper at Fort Benning, Georgia in December 1942. In 1943, he suffered a broken back and leg when his chute opened late and improperly. He almost died from his injuries and was subsequently discharged from the service for medical reasons. A part of his injury was an unfortunate condition for a catcher, where in looking straight up caused him to lose the flow of oxygen to the brain, and he would pass out. As a result, he never regained all of his mobility after the parachute jump and was never responsible for catching pop-ups.
Mancuso spent the rest of his life with back and legs pains, but he worked himself back into shape and returned to baseball in 1944 as one of two catchers for the only St. Louis Browns club to ever win an American League pennant. He shared duties with Red Hayworth, hitting .205 with one home run and 24 RBI in 88 games. The Browns lost to the St. Louis Cardinals in the 1944 World Series in six games, but Mancuso hit .667 and collected one RBI in injury-limited pinch-hitting duty. His most productive season came in 1945, when he posted career-numbers in games (119), batting average (.268), RBI (38) and runs (39). In 1946 he hit .240 with a career-high three home runs in 87 games. He played his last major-league season with the Washington Senators in 1947 at the age of 29.
From 1948 to 1955, Mancuso earned further respect as a catcher for top minor league clubs like Toledo and Beaumont, among others, and with the 1953 Houston Buffs, a minors club that preceded the Colt .45s & Astros. He also played winter baseball in the Venezuelan League during the 1950-51 and 1951-52 seasons. In his first season, he hit .407 with 49 RBI and also became the first player in the league to hit 10 home runs in a 42-game schedule. In a four-year major league career, Mancuso played in 337 games, accumulating 241 hits in 1,002 at bats for a .241 career batting average along with 5 home runs, 98 runs batted in and a .314 on-base percentage. He posted a ,987 fielding percentage as a catcher. In his seventeen-year minor league career, he played in 1,267 games, accumulating 1,087 hits in 3,936 at bats for a .276 career batting average along with 128 home runs.
After baseball retirement, Mancuso served for 30 consecutive years (1963-93) on the Houston City Council. During his political life, he gave of himself generously to the needs of the young people and to causes benefiting disadvantaged children. He also supported the creation of Lake Livingston and Lake Conroe reservoir to meet the city's long-term water needs, the construction of Houston Intercontinental Airport, and was chairmanship of a special committee that recommended the Houston Fire Department have its own ambulance service. In the late 1990s, Harris County built the Frank Mancuso Sports Complex, a facility that reaches out to the needs of inner city kids, in his honor. His 2003 induction into the Texas Baseball Hall of Fame reunited him with his older brother, Gus Mancuso (1905-1984), as the second member of the family to be inducted. Mancuso died August 4, 2007 in Pasadena, Texas at the age of 89.
29° 42.903, -095° 18.129
Forest Park Lawndale Cemetery