The VECSEL THz source has the promise to deliver mW to Watt-level power at frequencies within and beyond the THz gap. While electronic THz sources tend to drop off in power as one enters this gap on the low frequency side, the current VECSEL THz power scales up between linearly and quadratically with increasing frequency. A room temperature mW power laboratory demonstration at 0.765 THz far exceeds the widely published nW-level power demonstrated with room temperature quantum cascade lasers. The VECSEL THz source would have a shoebox size footprint and is both cost and performance competitive with all existing commercial THz technologies. A specific technology currently under investigation with this source is the detection of and countermeasures to Improvised Explosive Devices. The VECSEL THz device can be used both as a narrow band frquency stable source for driving heterodyne receivers at key frequencies between 1 and 5 THz (1.4, 1.9, 2.7, 4.7, etc.) or for laboratory sources to characterize THz components, including MMIC's or possibly for active spectrometers in an in-situ environment. Additionally, the proposed source would enable the development of THz array receivers for use in space and suborbital missions, or for atmospheric sounders and planetary landers. For example, the VECSEL THz source could potentially find immediate use on the Stratosphere THz Observstory, SOFIA, and several SMEX/MIDEX mission concepts (eg. STIM, GTO).