The near-millimeter wavelength region (3.2mm - 0.3mm) is being investigated for military systems applications during adverse weather and in the presence of smokes, dust and other particulate clouds. The use of near-millimeter wavelengths (NMMW) has advantages and disadvantages relative to the use of the infrared and microwave regions. The atmosphere is a dominant factor in determining the operation of military systems in the NMMW region. Systems currently under consideration for NMMW applications include beam rider and command guidance, missile plume detectors, low-angle tracking radars, terminal homing systems, target acquisition radars, fuze systems, quasi-imaging radars and hybrid (IR/NMMW) systems. Recent NMMW technological developments (e. g., sources, receivers, components, phenomenology and measurements) have been advancing at a rapid pace to meet system needs.