NICER observation list: Target ID 252002

The ultracompact white dwarf systems HM Cnc and V407 Vul represent unique opportunities to probe binary evolution driven by gravitational radiation and mass transfer. Initial {\it NICER} observations have provided new, precise frequency measurements in both systems, and a first indication for a slowing of the spin-up in HM Cnc. We propose additional observations to extend the timing baselines for each source, enabling new, unique probes of their orbital evolution.