Company A, 29th Infantry
If 29th Infantry is the unit indicated on his discharge, this means only that A/29 was, essentially, the official custodian of his records while he was being processed out of service. May or may not have been the unit he served with overseas and probably wasn't. In Europe, the regiment was separate, non-divisional, assigned at corps- and army-level and performed security duties. Saw no combat that I can determine.