What is tdy mean?

TDY stands for Temporary Duty and refers to a temporary assignment or deployment of military personnel to a location other than their permanent duty station. This can involve travel to a different location for training, special duty, or other short-term assignments. TDY assignments typically last for a few days to several months, and the military member receives per diem allowances to cover expenses such as lodging, meals, and incidentals while on temporary duty. TDY assignments are common in the military to provide additional training or support in specific locations as needed.