Private Kenneth Ruppersberger, 33 435 646, Army of the United States, was assigned to the 168th Infantry when he disappeared 29 November 1943 in Italy. 168th Infantry was an element of 34th Infantry Division (186th Infantry served in the Pacific Theater as an element of 41st Infantry Division).
Theres a memorial inscription the American Battle Monuments Commission Sicily-Rome Cemetery, Nettuno, Italy. Apparently no remains have ever been recovered (a great many remains of individuals declared missing have been - and continue to be - found since the end of the war).
You can order his deceased file. You'll find practical instructions at Message #2112. Go back to the Main Page, enter "2112" in the box in the upper right corner marked "Jump to #_____" then click on "Go". This file will contain a wealth of useful information. If you wish, contact me and, time permitting, I'll help you "interpret" it when it arrives.