This paper is based upon an effort in support of the Armstrong Laboratory, Helmet Mounted Sensory Technology Advanced Development Program (HMST ADP). That effort produced a report which provided the HMST ADP with information to make informed helmet system development decisions. These would be based upon not only crew, but aircraft and mission requirements. Specifically addressed were the following items (portions of them are discussed within this paper): the background of Helmet Display (HD) research and USAF decisions, current aircraft capabilities that support HDs, HD types, aircraft and HD utility, integration with current and future avionics and weapon systems and some analytical conclusions. This work was to project the potential elements which make up those decisions, such as crew, weapons, sensors, aircraft and missions into four HD option descriptions as representative of the technology for examination. These four are discussed throughout this paper as: austere, semi- austere, helmet-mounted head-up display (HUD) and helmet-mounted display (HMD).