The BEAR (Beam Experiment Aboard Rocket) accelerator will be part of an experiment to demonstrate the operation of an ion accelerator in space and to characterize the exoatmospheric propagation of a neutral particle beam. The RFQ (radiofrequency quadrupole) has been designed to produce a 25 mA H − beam with an emittance of 0.01π cm mrad (rms normalized) at an energy of 1 MeV. Because of the rigors of spaceflight, the accelerator design has been constrained by factors not normally applicable to conventional terrestrial accelerators. These factors and the mechanical features are described in a companion paper in these proceedings. The design techniques developed for BEAR would be applicable whenever rugged, lightweight, or power-efficient systems are required. The BEAR RFQ has been operated under power with the beam in the laboratory. This paper presents details of measured beam transport, emittance, and energy spectra.