Dan's personal physician who initially defers to the military doctors but later uncovers the truth about the MX-3 cover-up. He chooses to protect Dan by concealing the reality of his son's death and the military's intentions.
Caldwell is Dan's personal doctor, initially kept in the dark about the cover-up.
Spencer reveals the truth to Caldwell, who agrees to shield Dan from the Army.
Caldwell works alongside Army doctors at the hospital, initially deferring to their authority.
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