  COMPLETE is a flagship mission concept combining broadband spectroscopic
imaging and comprehensive magnetography from multiple viewpoints around the Sun
to enable tomographic reconstruction of 3D coronal magnetic fields and
associated dynamic plasma properties, which provide direct diagnostics of
energy release. COMPLETE re-imagines the paradigm for solar remote-sensing
observations through purposefully co-optimized detectors distributed on
multiple spacecraft that operate as a single observatory, linked by a
comprehensive data/model assimilation strategy to unify individual observations
into a single physical framework. We describe COMPLETE's science goals,
instruments, and mission implementation. With targeted investment by NASA,
COMPLETE is feasible for launch in 2032 to observe around the maximum of Solar
Cycle 26.
