Which former Marine, discharged in 1959, later took a fateful job at the Texas School Book Depository in Dallas?

After his 1711 opera "Rinaldo" made his name in London, which composer left Hanover to settle in England? After his 1859 hanging, Civil War troops sang of which abolitionist's "body a-mouldering in the grave"? After his 1901 opera "Feuersnot", which composer turned to Oscar Wilde's play "Salome" for his next opera? After his 1955 death, whose papers went to Jerusalem's Hebrew University and whose violin went to his grandson? After his 1960 Army discharge, which rock star was back in uniform playing a GI in "G.I. Blues"? After his five-year voyage of 1831 to 1836, which naturalist never went abroad again, having been seasick much of the t… After his 56-game hitting streak ended in 1941, which Yankee hit safely in his next 16 games? After his April 1775 ride, which patriot rescued a trunk of John Hancock's papers from a Lexington tavern?