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Good about that. >> reporter: between missions, the crews maintain equipment, prep the helicopters and work out. >> when the call comes, flip that switch. its go time. >> reporter: in afghanistan, these days, its often go time. they have received another category alpha. an american convoy has been hit by an ied. one american is severely injured. details about the condition are radioed in as the helicopter speeds to the blast speed at 100 miles per hour. >> lower extremities unknown. conscious. m...