What does DAPP stand for?

Daily Ambient Photophase - Biochronometry

Data Acquisition and Processing Program - Later, DMSP - Air Force

Data Acquisition and Processing Program Satellite (SAUS)

Deadweight Average Pig Price (FLAA)

Defense Acquisition Pilot Program - Army

Department of Army Productivity (Improvement) Program

Design Aid for Post-Processors - IBM Corp.

Development Aid from People to People (EAIO)