low-level nuclear testing

low-RCS target / low-radar-cross-section target

low flying aircraft / low-flying aircraft

low-flying, low-speed drone

low nuclear yield

low-yield nuclear weapon

low-yield tactical nuclear-weapon system

super-low yield nuclear weapon

low-level bombing

low-level cruise trajectory

low-level transit routes (LLTR)

low-level laydown (laydown bombing)

low level pressure chart

low level wind shear

low level wind shear alert system (LLWAS)

low-level flight

low-level jet

low-level radiation

low-level radar

low-level combat

low-level cyclone

nuclear suitcase bomb; man-portable nuclear weapon

depot maintenance (beyond O and I level activities, performed in an industrial-type facility) / D-level maintenance

psychological testing

hardware redundancy testing

barrel-testing rod

block testing stand

hydraulic testing equipment

incremental proof testing

bench testing program

bond testing

fatigue testing machine

fault testing