I found a bit more info on PFC Gleason, 2 brief items in a database compiled by a veteran of the 115th Inf Regiment
"Gleason John T 36570025 Pfc HqCo1Bn116 13-Jun-44 fr repl depot to dy 116 HqCo1Bn
Gleason John T 36570025 Pfc HqCo1Bn116 3-Jul-44 fr dy to KIA 13 June 116 HqCo1Bn"
Found here: http://www.angelfire.com/md/29division/page22.html
The database is an Excel file about 6 megabytes in size. From the source page "Every company, battery, or troop in the 29th Infantry Division compiled a daily "Morning Report" indicating personnel changes over the preceding 24-hour period. The information collected in these reports is crucial to the modern researcher because it includes a compilation of company members who were killed, wounded, injured, ill, promoted, or transferred. Furthermore, the arrival of fresh replacements and men returning to the unit after hospital stays or temporary transfers are also listed.
Thanks to Ralph Windler, a former member of Company G, 115th Infantry, the Morning Reports of the 116th Infantry during the 29th Division's period in combat have been fully compiled in an Excel spreadsheet. To view this compilation, click on the link below. NOTE: You must have Microsoft Excel installed on your computer, preferably version 2003 or later, to view this spreadsheet. Members of the 116th Infantry who served in combat from June 1944 to May 1945 are listed alphabetically. Every effort has been made to ensure accuracy in this list, but information on the original cards was occasionally inaccurate, and even worse, on occasion entries were illegible."
I don't know the exact meaning of the abbreviations used in these morning reports. My best guess is that PFC Gleason was assigned to the headquarters company of the 1st Battalion 116th Infantry Regiment 13 June 1944 from a replacement depot and KIA the same day. If anyone has better information, please post it.