3. Infantry 4. Field Artillery 5. Coast Artillery 6. Engineer Corps 7. Quartermaster Corps 8. Signal Corps] [Illustration: U. S. Army. Enlisted men’s insignia worn on collars of service coats 1. Hospital Corps 2. Ordnance Corps 3. Band Musician 4. Electrician 5. Infantry, Porto Rico Regiment 6. Infantry, Native Troops, Philippines 7. Recruiting Service 8. Prison Guard] _Identification Patch._—In order that the men in an advance line of attack upon the battlefield may be recognized by the officers who are controlling their advance and accurately placing the curtain of shrapnel fire ahead of them, it has become necessary to prescribe identification patches upon the backs of the men’s coats between the shoulders. These identification patches are of different designs and colors to mark the different regiments and brigades, circles, triangles, squares and other shapes being used. The shape and color of these patches is not laid down in uniform regulations in the United States Army, but these details are prescribed from time to time in orders from Headquarters of the Field Armies. _United States Guards_, _National Army_, are organized into battalions for guard duty in the United States during the period of the existing emergency. Their prescribed uniform is the blue dress uniform of the regular army with blue overcoats and the customary insignia. _Citizen’s Training Camps._—The uniform for members of these camps consist of olive-drab shirt, breeches and coat, canvas leggings, russet shoes, and field hat with red, white and blue hat cord. The bronze letters “U. S. T. C.” are worn on the collar, and on the left forearm a badge with the same letters. _Reserve Officers’ Training Corps._—The uniforms are olive-drab or “Cadet gray.” Insignia of rank are of white metal for cadet officers and gilt for instructors; _Colonel_, three diamonds; _Lieutenant Colonel_, two diamonds; _Major_, one diamond; _Captain_, three disks; _First Lieutenant_, two disks, _Second Lieutenant_, one disk. Sergeants and corporals wear chevrons prescribed for the Regular Army. On the cap is a wreath enclosing the letters “R. O. T. C.” in bronze and the same letters are worn on the collar. On the left arm is a badge with “R. O. T. C.” embroidered in the color of the arm of the service. [Illustration: SEAL OF THE U. S. NAVY DEPARTMENT] CHAPTER V UNIFORMS AND INSIGNIA OF THE U. S. NAVY The uniforms of the officers and enlisted men of the United States Navy are made of dark blue cloth for wear in cold or temperate weather and of white duck for wear in hot or tropical weather. U. S. NAVAL OFFICERS’ UNIFORMS [Illustration: _Copyright, G. V. Buck, Washington, D. C._ Admiral William S. Benson Chief of Naval Operations, United States Navy]