What does LADD stand for?

Left Anterior Descending Diagonal - Branch of coronary artery - Anatomy (DAVI)

Lens Antenna Deployment Demonstration (ACAE)

Lifetime Average Daily Dose (IDEM)

Low-Altitude Drogue Delivery (AFM)

Lowest Acceptable Daily Dose (EPAT)

Ladd's Reports - 59-64 New Hampshire - A publication (DLA)