  Enabled by the Fermi Large Area Telescope, we now know young and recycled
pulsars fill the gamma-ray sky, and we are beginning to understand their
emission mechanism and their distribution throughout the Galaxy. However, key
questions remain: Is there a large population of pulsars near the Galactic
center? Why do the most energetic pulsars shine so brightly in MeV gamma rays
but not always at GeV energies? What is the source and nature of the pair
plasma in pulsar magnetospheres, and what role does the polar cap accelerator
play? Addressing these questions calls for a sensitive, wide-field MeV
telescope, which can detect the population of MeV-peaked pulsars hinted at by
Fermi and hard X-ray telescopes and characterize their spectral shape and
polarization.
