In speaking to an officer, always stand at attention and use the word "Sir." Examples: "Sir, Private Brown, Company B, reports as orderly." "Sir, the first sergeant directed me to report to the captain." (Question by an officer:) "To what company do you belong?" (Answer:) "Company H, sir." (Question by an officer:) "Has first call for drill sounded?" (Answer:) "No, sir;" or "Yes, sir; it sounded about five minutes ago." (Question by an officer:) "Can you tell me, please, where Major Smith's tent is?" (Answer:) "Yes, sir; I'll take you to it." Use the third person in speaking to an officer. Examples: "Does the Lieutenant wish," etc. "Did the Captain send for me?" In delivering a message from one officer to another, always use the form similar to the following: "Lieutenant A presents, his compliments to Captain B and states," etc. This form is not used when the person sending or receiving the message is an enlisted man. In all official conversation refer to other soldiers by their titles, thus: Sergeant B, Private C. =909.= In rendering personal honors, when the command _present arms_, officers and men in uniform who are not in formation and are in view and within saluting distance shall salute and shall remain in the position of salute until the end of the ruffles and flourishes, or, if none, until _order arms_. (_Cavalry Drill Regulations, 1916._) This extract covers the conduct of officers and soldiers who may be in the vicinity of troops rendering honors to the President or other persons entitled to personal salutes. CHAPTER II. ARMS, UNIFORMS, AND EQUIPMENT. =Section 1. The rifle.= The rifle now used by the Army of the United States is the United States magazine rifle, model of 1903, caliber .30. It is 43.212 inches long and weighs 8.69 pounds. The bayonet weighs 1 pound and the blade is 16 inches long. The rifle is sighted for ranges up to 2,850 yards. The maximum range, when elevated at an angle of 45 degrees, is 4,891 yards (389 yards less than 3 miles). The smooth bore of the rifle is 0.30 inch in diameter. It is then rifled 0.004 inch deep, making the diameter from the bottom of one groove to the bottom of the opposite groove 0.308 inch. The rifling makes one complete turn in each 10 inches of the barrel. The accompanying plate shows the names of the principal parts of the rifle. The only parts of a rifle that an enlisted man is permitted to take apart are the bolt mechanism and the magazine mechanism. Learn how to do this from your squad leader, for you must know how in order to keep your rifle clean. Never remove the hand guard or the trigger guard, nor take the sights apart unless you have special permission from a commissioned officer. The cartridge used for the rifle is called the .30-caliber model 1906 cartridge. There are four types of cartridges.