After the section about Company F, the following note is found: ""Those with an AF (Absent Furlough) in most engagements just indicates they were just in rear of the army, straggling, barefooted. There were some who made it a point to be barefoot, during the fighting months and some few who always became suddenly ill and went to the rear when the cannons began to boom on the eve of going into battle."" The author is not noted, tho the handwriting looks like Sgt Major Mayo’s.
If you have not been there, you should try and go. The book has a lot of comments like the above. I would suspect similar comments for the other regiments in Hays' Brigade.
JIMT