  We characterize mission profiles for human expeditions to near-Earth
asteroids, Venus, and Mars. Near-Earth objects (NEOs) are the closest
destinations beyond cis-lunar space and present a compelling target with
capabilities already under development by NASA and its partners. We present
manned NEO mission options that would require between 90 days and one year. We
next consider planetary flyby missions for Venus along the lines of plans that
were first drafted during the Apollo program for human exploration of Venus. We
also characterize a Mars flyby, and a double-flyby variant that would include
close passes to both Venus and Mars. Finally, we consider orbital missions to
Venus and Mars with capability for rendezvous with Phobos or Deimos. This would
be a truly new class of mission for astronauts and could serve as a precursor
to a human landing on Mars. We present launch opportunities, transit time,
requisite {\Delta}V, and approximate radiation environment parameters for each
mission class. We find that {\Delta}V requirements for each class of mission
match near-term chemical propulsion system capabilities.
