Intro: Cast-in-place concrete has a long track record in general construction. For a live-fire training facility specifically, precast modular construction solves practical problems cast-in-place doesn't.
Timeline
Cast-in-place requires forms, on-site pouring, and cure time before the next phase can proceed. Precast panels are manufactured off-site and simply installed - a meaningfully different project timeline.
Consistency
Manufacturing panels under controlled conditions produces more consistent material quality than pouring concrete on a job site subject to weather and site variables.
Reconfigurability
A modular, panel-based structure can be reconfigured later - walls moved, layouts changed - in a way a monolithic cast-in-place structure simply can't be, without demolition.
The Net Result
Faster installation, more consistent quality, and a structure that isn't locked into one layout for its operational life. For a training facility meant to serve evolving mission needs, that combination matters more than it would for a standard building.