WW2 discharge papers; what does "days lost for Article of War (AW) 107" mean?

Articles of War, section 107.
Almost certainly, he got drunk and was put in confinement for a couple of days.
This article pertains to absence without authority, but it was commonly applied to Soldiers who got drunk to the point of not being able to report for duty the subsequent day. The time they missed was "lost" and they had to make it up before their term was over.

Hi. I'm not a member of the forum, but I've been looking into this question as well. A great many veterans seem to have more than 0 days indicated here, and I think civilians can jump to the worst interpretation of the phrase "Absent Without Leave." After all, there are circumstances under which being AWOL in a time of war is punishable by firing squad, yes? But the Article of War someone else quoted - correctly - indicates a spectrum of behavior. And some discharge papers indicate hundreds of days lost. Usually there was no accompanying court martial to account for this time, and usually the discharges are honorable in spite of whatever the case was. Here's a more innocent example of a situation that could land a soldier in the predicament of having to remain in service after he would otherwise have been dismissed, to make up for lost days. If he'd been doing something dumb that he had no business doing, either because he was drunk or because he was 18 and invincible, and he hurt himself badly enough to render himself unfit for duty, he might have been required to make up the time spent in recovery. Just a thought...

My father's discharge papers say " 500 Days lost AW 107 Current Enlistment." What do you have to do to get 500 days punishment?