  Arguably, the most popular candidate for Dark Matter (DM) is a massive,
stable, Majorana fermion. However, annihilation of Majorana DM to two fermions
often features a helicity-suppressed s-wave rate. Radiating a gauge boson via
electroweak (EW) and electromagnetic (EM) bremsstrahlung removes this s-wave
suppression. The main purpose of this talk is to explain in some detail why the
branching ratio to a fermion pair is likely suppressed while the decay to the
pair plus a W/Z is not. In doing so, we investigate the general conditions for
s-wave suppression and un-suppression using Fierz transformations and partial
wave expansions. Suppression for the 2-to-2 process is sufficiently severe that
the EW and EM bremsstrahlung are likely to be the dominant modes of
gauge-singlet Majorana DM annihilation. We end this talk with a discussion of
the challenge presented by space-based data for Majorana DM models, given that
the enhanced rate to radiated W and Z gauge bosons and their dominant decay via
hadronic channels tends to produce more anti-protons than are observed.
