I thought I posted this earlier - prior to responding to your e-mail.
Private First Class John P. Johnson, 35 143 959, Army of the United States died 10 May 1944 while serving with 168th Infantry, 34th Infantry Division in Italy. He's interred in Grave 21, Row 6, Section H of the American Battle Monuments Commission Sicily-Rome Cemetery at Nettuno, Italy.
You can request his deceased file. You'll find instructions at Message #2112.