5. Machine Guns.--A. The concealment of machine gun emplacements is important. Consequently, it is only at night or in case of attack that machine gun crews will occupy their defense emplacements. At night guns should take up other position than their defense emplacements and fire a stated number of rounds in order to test out the guns and mislead the enemy as to their numbers and real emplacements, after which they will at once go back to their defense emplacements. B. The guns and their crews will be tactically under the orders of the company commander in whose sector they are located, but no alteration will be made by him in their disposition or arcs of fire; he will, however, bring before the senior machine gun instructor any suggestions for improvements in machine gun dispositions for defense. C. Two men per gun will always be on duty with the guns. D. Range cards will be prepared and kept with each gun. E. Officers and non-commissioned officers in charge of guns will remain in close proximity to the guns. They will frequently inspect their guns, emplacements, etc. They are responsible for cleanliness and maintenance of the emplacements. F. Machine gun commanders are responsible for guns always being ready for action, and that emplacements are clear of all material except such as is required for the service of the guns; that embrasures or loopholes are kept clear of all obstructions which may interfere with fire or view. 6. Reliefs.--A. Reconnaisance. Prior to taking over the line of trenches the company commander, accompanied by his senior First Lieutenant and First Sergeant, will reconnoiter the trenches. B. Points to be noted by the company commanders. The following points will be specially noted by company commanders before taking over trenches: 1. Plan of occupation (number of men holding lines to be taken over, their distribution and duties). 2. Shelter accommodations. 3. Work being done and proposed. 4. Conditions of the wire and defenses generally. 5. Information as to the enemy, his habits, snipers, and the work he is doing, etc. 6. Water supply. 7. Artillery support. 8. Communications. 9. Danger points. 10. Location and condition of stores. 11. Liaison. 7. Guides.--A. Arrangements will be made between the company commanders of the incoming and outgoing companies as to the rendezvous where guides will be provided by the latter to conduct the incoming troops to the trenches. B. One guide per platoon, one for each company and one for battalion headquarters will be provided. These guides must know the exact spot where they will meet the relief troops and the best way to conduct the units to the particular section of the trench they will occupy. 8. Smoking and Talking.--A. After leaving the rendezvous there will be no smoking and talking until arrival in trenches. Strictest march discipline will be enforced on the way to and from the trenches.