=870.= After the salutes have been acknowledged by the officers of the day, each guard returns saber by command of its own officer of the guard; the commander of the new guard then directs the orderly or orderlies to fall out and report. =871.= The commander of the new guard then falls out members of the guard for detached posts, placing them under charge of the proper noncommissioned officer, divides the guard into three reliefs, _first_, _second_, and _third_, from right to left, and directs a list of the guard to be made by reliefs. The sentinels and detachments of the old guard are at once relieved by members of the new guard, the two guards standing at ease or dismounted while these changes are being made. The commander of the old transmits to the commander of the new guard all his orders, instructions, and information concerning the guard and its duties. =872.= The commander of the new guard then has his own guard fall out, takes possession of the guardhouse and verifies the articles in charge of the guard. =873.= If considerable time is required to bring in that portion of the old guard still on post, the commanding officer may direct that as soon as the orders and property are turned over to the new guard the portion of the old guard at the guardhouse may be marched off and dismissed. In such case the remaining detachments of the old guard will be inspected by the commander of the new guard when they reach the guardhouse. He will direct the senior noncommissioned officer present to march these detachments off and dismiss them in the prescribed manner. =874.= In bad weather, at night, or after long marches the music may be omitted, or the buglers may take the place of the band and sound off standing on the right of the guard and the march in review be omitted. In cases in which an organization, entire or in part, is detailed for guard, it is marched to the parade ground as a single detail (Par. 858.) =875.= For detailed instructions for guards and sentinels see Manual of Interior Guard Duty. FORMAL GUARD MOUNTING, DISMOUNTED. =876.= Guard mounting, dismounted, and relieving the old guard are conducted on the same principles as when mounted, with the following modifications: (_a_) The men designated for guard fall in, dismounted, on their troop parade grounds; noncommissioned officers not commanding detail, 2 paces in rear of rank. (_b_) The detail that is to be on the right is marched to the line so that upon halting the breast of the man on the right shall be near to and opposite the left arm of the sergeant major. At the command =DRESS=, the detail dresses up to the line of the sergeant major and its commander, the man on the right placing his breast against the left arm of the sergeant major.