–When you see a person approaching your post, take the position of port arms and call, “Halt!
–Who is there?” The challenge must be made at a distance sufficient to prevent your being rushed by the person being challenged. If the person answers “Friend” or “Petty officer of the guard” or gives another reply indicating a friendly nature, call, “Advance (friend, and so on) to be recognized.”
–If you challenge a party of persons, after receiving a reply indicating the party is friendly, you call, “Advance one person to be recognized.”
–When you have identified the one, you have the person bring up the rest of the party and identify each individual.
–You must positively identify all persons challenged before permitting them to pass.
–If you can’t identify them to your satisfaction, detain them and call the petty officer of the guard.
–Never let more than one person advance at a time.
–If two persons approach at the same time, have them halt; then advance the senior and pass that person (if properly identified) before advancing the other person.
–If the people are in a vehicle, you halt the vehicle and inspect the driver’s or the passengers’ credentials, as appropriate. (Normally, inspecting the driver of a military vehicle is sufficient; but for a commercial truck or taxi, you should check the passengers too.) If you believe there’s something suspicious about the vehicle or its occupants, direct one of the occupants to get out and approach you for recognition. If you aren’t satisfied beyond a reasonable doubt that the people are authorized to pass, detain the person or party and call the petty officer of the guard.
–When challenging, advancing, and passing persons and patrols, always stand where you can get a good look at them in such a way that you are protected from a surprise attack.