preliminary study

preliminary bombardment

preliminary rifle instruction (PRI)

preliminary development (PD)

preliminary information pamphlet

preliminary order

preliminary order list

preliminary engineering inspection

exercise study

field study

Institute for the Study of War (ISW)

leadership exercise study

long term study

staff study

feasibility study (FS)

foreign area and language study

aircraft refuel and rearm study

hind-sight analysis / study

accident data reporting study group

safety oversight study group

aerodrome meteorological observing systems study group

aeronautical data modeling study group

aeronautical information and charts study group

aircraft classification number study group (ACNSG)

aircraft noise and design effects study (ANDES)

aircraft noise design effects study

aircraft type designation study group

airport design study group

automatic air reporting study group

aviation medicine study group on cardiovascular requirements

aviation medicine study group on visual requirements

aviation security study group

elimination of ambiguity in radiotelephony call signs study group