An Army Major who oversees the secret medical study and cover-up regarding the accidental MX-3 nerve gas leak. He manipulates hospital staff, keeps Dan sedated, and collects a blood sample from Dan's corpse before the military erases the incident.
Dan views Holliford and the Army as responsible for his son's death and the cover-up.
Caldwell works alongside Army doctors at the hospital, initially deferring to their authority.
Both are Army doctors collaborating to study the toxin and manage the cover-up.
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