Crawford refers to Howard Bowen as a captain. However, he wears the insignia of a major.
When the two Air Force officers are about to go after Dr. Greenspan and Jacob on the road in Montana, the one in the passenger seat pulls back the slide of his 1911-style pistol. The slide stays back, then he releases it using the slide release on the left side of the pistol. If the magazine in the firearm was loaded with cartridges, the slide wouldn't stay open, it would release on its own after being pulled back and load a cartridge into the chamber as it slid forward.