shall be displayed from each masthead. The national ensigns displayed at the mastheads shall be of uniform size, except when, due to a substantial difference in heights of mastheads, a difference in the size of national ensigns is appropriate.

2. On occasions of full-dressing ship, in addition to the dressing of the mastheads, a rainbow of signal flags, arranged in the order prescribed in Navy Department publications, shall be displayed, reaching from the foot of the jackstaff to the mastheads and thence to the foot of the flagstaff. Peculiarly masted or mastless ships shall make a display as little modified from the rainbow effect as is practicable.

3. When dressing or full-dressing ship in honor of a foreign nation, the national ensign of that nation shall replace the United States national ensign at the main, or at the masthead in the case of a single-masted ship; provided that when a ship is full-dressed or dressed in honor of more than one nation, the ensign of each such nation shall be displayed at the main, or at the masthead in a single-masted ship.

4. Should half-masting of the national ensign be required on occasions of dressing or fulldressing ship, only the national ensign at the flagstaff shall be half-masted.

5. When full-dressing is prescribed, the senior officer present may direct that dressing be substituted if, in his opinion, the state of the weather makes such action advisable. He may also, under such circumstances, direct that the ensigns be hauled down from the mastheads after being hoisted.

6. Ships not under way shall be dressed or full-dressed from 0800 until sunset. Ships under way shall not be dressed or full-dressed. 2184. Senior Officer Present Afloat Pennant.

If two or more ships of the Navy are together in port, the senior officer present afloat pennant shall be displayed from the ship in which the senior officer present afloat is embarked, except when the personal flag of the senior officer present afloat clearly indicates his seniority. It shall be displayed from the inboard halyard of the starboard main yardarm.

2185. Ships Passing Washington's Tomb.

When a ship of the Navy is passing Washington's tomb, Mount Vernon, Virginia, between sunrise and sunset, the following ceremonies shall be observed insofar as may be practicable: The full guard and band shall be paraded, the bell tolled, and the national ensign half-masted at the beginning of the tolling of the bell. When opposite Washington's tomb, the guard shall present arms, persons on deck shall salute, facing in the direction of the tomb, and "Taps" shall be sounded. The national ensign shall be two-blocked and the tolling shall cease at the last note of "Taps," after which the national anthem shall be played. Upon completion of the national anthem, "Carry On" shall be sounded. 2186. National Holidays.

1. The 1st of January, the 22d of February, the 30th of May, the 4th of July, the first Monday of September, the 11th of November, the fourth Thursday of November, the 25th of December, and such other days as may be designated by the President shall be observed as holidays on board ships of the Navy and at naval stations and activities.

2. Whenever any of the above-designated dates falls on Saturday, the preceding day shall be observed as a holiday, and whenever such date falls on Sunday, the following day shall be observed.

2187. Ceremonies for United States National Anniversaries and Memorial Day.

1. On the 22d of February and the 4th of July every ship of the Navy in commission, not under way, shall full-dress ship. At 1200 each saluting ship, and each naval station equipped with a saluting battery, shall fire a national salute of 21 guns.

2. On Memorial Day, May 30, each saluting ship, and each naval station having a saluting battery, shall fire at noon a salute of 21 minute-guns. All ships and naval stations shall display the national ensign at half-mast from 0800 until the completion of the salute, or until 1220 if no salute is fired.

3. When the 22d of February, the 30th of May, or the 4th of July occurs on Sunday, all special ceremonies shall be postponed until the following day.

2188. Foreign Participation in United States National Anniversaries or Solemnities.

1. Prior to celebrating a United States national anniversary, or observing a national solemnity, in a foreign place or in the presence of foreign warships, the senior officer present of the United States naval service shall give due notice to the foreign port authorities, and to the senior officer of each nationality present, of the time and manner of conducting the celebration or solemnity, and shall, as appropriate, invite their participa

tion therein. An officer shall be sent to thank the foreign authorities or ships which participate in such celebration or solemnity.

2. When foreign troops participate in parades within the territorial jurisdiction of the United States, they shall be assigned a position of honor ahead of United States troops, except that a small detachment of United States troops will immediately precede the foreign troops as a guard of honor.

3. On occasions when troops of two or more foreign nations participate, the troops of the nation in whose honor the parade is held will be assigned a position ahead of all others, otherwise the order of precedence among foreign troops will be determined, as appropriate, by:

(a) The relative ranks of the commanders of the forces from which the parade detachments are drawn; or

(b) The relative ranks of the commanders of the parade detachments; or

(c) The alphabetical order in the English language of the names of the nations concerned.

2189. Observance of Foreign Anniversaries and Solemnities.

1. In a foreign place, or when in company

with a foreign warship, when a national anniversary or solemnity is being observed by foreign port authorities or a foreign warship, a ship of the Navy shall, upon official invitation, follow the example of the foreign authority or warship in full-dressing or dressing ship, firing salutes, and half-masting ensigns. Salutes shall not exceed 21 guns unless the senior officer present deems it proper to fire a larger number in order to participate properly in the ceremony, or to avoid giving offense. Upon all such occasions efforts shall be made to accord, so far as practicable, with the foreign authorities in the time and manner of conducting the ceremonies.

2. Uniform accoutrements of mourning, including mourning badges or bands, may be worn on the uniform when appropriate, or when directed by competent authority, by persons in the naval service who are stationed in, or who are officially visiting, a foreign nation during the period that the foreign government ordains as the period of national mourning.

NOTE.-There is no article 2190.