_Judge Advocate General’s Department._—A sword and pen crossed and surmounted by a wreath, all of gold. _Quartermaster Corps._—A sword and a key crossed on a wheel surmounted by an eagle, in gold except the rim of the wheel which is in blue enamel set with thirteen gold stars. _Medical Corps._—A caduceus of gold. _Medical Reserve Corps._—The same surmounted by the letters “R. C.” in bronze. _Sanitary Corps._—The same surmounted by the letters “S. C.” _Dental Surgeons._—The same surmounted by the letters “D. C.” in bronze. _Acting Dental Surgeons._—The same in silver with gold letters. _Ordnance Department._—A flaming spherical shell of gold. _Signal Corps._—Two crossed signal flags with a vertical torch at the center, all of gold. _Cavalry._—Two sabers of gold crossed with the number of the regiment in the angle above them. _Field Artillery._—Two field guns of gold crossed with the number of the regiment in the angle above them. _Coast Artillery._—Two gold cannons crossed, surmounted at the center by an oval of red enamel with a gold projectile point up. _Infantry._—Two gold rifles crossed with the number of the regiment in the angle above them. _Philippine Scouts._—The same as for infantry but with the letter “P” in the angle above the crossed rifles. _Porto Rico Regiment._—The same but with the letters “P. R.” _Aides-de-camp._—A shield of the United States surmounted by a spread eagle of gold, the stripes of the shield red and white and the field blue enamel with gold stars, the number of which correspond to the rank of the General officer upon whose staff the aide-de-camp is serving. _Regimental Staff Officers._—Regimental adjutants and quartermasters have the devices of the insignia of the Adjutant General’s Department or of the Quartermaster Corps respectively in the angle below the insignia of their arm of the service. _Veterinarians._—An insignia consisting of a caduceus surcharged with the letters V. C. _Assistant Inspectors_ of small arms practise for regiments of the Organized Militia wear the insignia of the arm of the service to which the regiment belongs with the number of the regiment above it and a bursting shell below it. _Officers’ Buttons._—The design for Engineers is an eagle with the motto “Essayons” above a fort and rising sun, and for other officers it is the U. S. coat of arms. [Illustration: U. S. Army. Officers’ collar insignia indicating arm of the Service, Corps or Department 1. All officers of the Regular Army 2. All officers of the National Army 3. All officers of the Reserve 4. All officers of the National Guard 5. Quartermaster Corps 6. Signal Corps 7. Inspector General’s Department 8. Judge Advocate General’s Department] [Illustration: U. S. Army. Officers’ collar insignia indicating arm of the Service, Corps or Department 1. Adjutant General’s Department 2. General Staff Corps 3. Medical Corps 4. Sanitary Corps 5. Veterinary Corps 6. Chaplain]