A battalion is a military unit, typically consisting of three hundred to one thousand soldiers commanded by a lieutenant colonel and subdivided into a number of companies, each typically commanded by a major or a captain. The typical battalion is built from three operational companies, one weapons company and one headquarters company. In some countries, battalions are exclusively infantry, while in others battalions are unit-level organisations.
A brigade is a major tactical military formation that typically comprises three to six battalions plus supporting elements. It is roughly equivalent to an enlarged or reinforced regiment. Two or more brigades may constitute a division.
The American Expeditionary Forces (AEF) was a formation of the United States Armed Forces on the Western Front during World War I, comprised mostly of units from the U.S. Army. The AEF was established on July 5, 1917, in France under the command of then-Major General John J. Pershing. It fought alongside French Army, British Army, Canadian Army, British Indian Army, New Zealand Army and Australian Army units against the Imperial German Army. A small number of AEF troops also fought alongside Italian Army units in 1918 against the Austro-Hungarian Army. The AEF helped the French Army on the Western Front during the Aisne Offensive in the summer of 1918, and fought its major actions in the Battle of Saint-Mihiel and the Meuse-Argonne Offensive in the latter part of 1918.
The 13th (Western) Division was one of the Kitchener's Army divisions in the First World War, raised from volunteers by Lord Kitchener. It fought at Gallipoli, in Mesopotamia and Persia.
The 63rd Division was a United Kingdom infantry division of the First World War. It was originally formed as the Royal Naval Division at the outbreak of the war, from Royal Navy and Royal Marine reservists and volunteers, who were not needed for service at sea. For RN personnel, the designation HMS Victory IV was used. The division fought at Antwerp in 1914 and at Gallipoli in 1915. In 1916, following many losses among the original naval volunteers, the division was transferred to the British Army as the 63rd Division, re-using the number from the disbanded second-line 63rd Division Territorial Force. As an Army formation, it fought on the Western Front for the remainder of the war.
Wilbur Wright Field was a military installation and an airfield used as a World War I pilot, mechanic, and armorer training facility and, under different designations, conducted United States Army Air Corps and Air Forces flight testing. Located near Riverside, Ohio, the site is officially "Area B" of Wright-Patterson Air Force Base and includes the National Museum of the United States Air Force built on the airfield.
The 41st Infantry Division was an infantry division of the United States Army National Guard composed primarily of units from the Pacific Northwest. The division saw active service in World War I and World War II, receiving the nickname “Jungleers” during the latter.
The Aviation Section, Signal Corps, was the aerial warfare service of the United States from 1914 to 1918, and a direct statutory ancestor of the United States Air Force. It absorbed and replaced the Aeronautical Division, Signal Corps, and conducted the activities of Army aviation until its statutory responsibilities were suspended by President Woodrow Wilson in 1918. The Aviation Section organized the first squadrons of the aviation arm and conducted the first military operations by United States aviation on foreign soil.
The United States Marine Corps is organized within the Department of the Navy, which is led by the Secretary of the Navy (SECNAV). The most senior Marine commissioned officer is the Commandant of the Marine Corps, responsible for organizing, recruiting, training, and equipping the Marine Corps so that it is ready for operation under the command of the unified combatant commanders. The Marine Corps is organized into four principal subdivisions: Headquarters Marine Corps, the Operating Forces, the Supporting Establishment, and the Marine Forces Reserve.
The 142nd Field Artillery Regiment is a United States Army field artillery regiment currently represented in the Arkansas Army National Guard by the 1st Battalion, 142nd Field Artillery, headquartered in Bentonville, Arkansas; 2nd Battalion, 142nd Field Artillery, headquartered in Barling, Arkansas; and Battery F, 142nd Field Artillery stationed in Fayetteville, Arkansas, elements of the 142nd Field Artillery Brigade which is headquartered in Fayetteville, Arkansas. The regiment was created in 1917 from the former 2nd Arkansas Infantry. The 142nd Field Artillery shipped to France during World War I but did not see combat before the cessation of hostilities. The regiment was activated for World War II, but its battalions were redesignated as separate battalions, 1–142nd became the 936th Field Artillery Battalion, the 2–142nd became the 937th Field Artillery Battalion. The battalion's served throughout the European Theater of Operations. The battalions were activated again for the Korean War and served throughout the war. Following the Korean War, the separate battalions resumed their former designations of 1–142nd FA and 2–142nd FA. The 142nd Field Artillery Brigade, including both battalions, was activated for Operation Desert Storm. Elements of the 142nd Fires Brigade have been activated for service in Operation Noble Eagle and Operation Iraqi Freedom. The 142nd Fires Brigade was instrumental in support and recovery operations located in New Orleans, Louisiana after hurricanes Katrina and Rita devastated the Gulf Coast.
The 39th Infantry Division was an infantry formation of the Army National Guard, originally formed as the 18th Division in 1917. The division consisted of troops from Arkansas, Louisiana, and Mississippi. After training at Camp Beauregard, Louisiana, the division was deployed to France but did not see combat before the end of World War I. In July 1923 the division was re-designated as the 31st Infantry Division. The 39th Infantry Division was reactivated after World War II with troops from Louisiana and Arkansas and its headquarters in Louisiana. In 1967, the 39th Infantry Division was reorganized to become the 39th Infantry Brigade (Separate). Its headquarters was in Little Rock and the unit consisted entirely of troops from Arkansas.
The Motor Transport Corps (M.T.C.) was formed out of the United States Army Quartermaster Corps on 15 August 1918, by General Order No. 75. Men needed to staff this new corps were recruited from the skilled tradesmen working for automotive manufacturers in the US.
The Second Army Air Service was an Air Service, United States Army unit that fought on the Western Front during World War I as part of the Air Service, Second United States Army. It was demobilized in France on 15 April 1919 with the demobilization of the United States Second Army. There is no modern United States Air Force unit that shares its lineage and history.
The III Corps Observation Group was a United States Army Air Service unit that fought on the Western Front during World War I as part of the Air Service, First United States Army. It was demobilized on 12 May 1919. There is no modern United States Air Force unit that shares its lineage and history.
The Organization of the Air Service of the American Expeditionary Force on November 11, 1918, represents its maximum strength in World War I. Units of the Air Service are listed as assigned to the order of battle for that date, which was that of the Armistice with Germany. The first air unit arrived in France in September 1917, while the final air unit reaching the front did so on November 9, 1918. Unit operations began in April 1918. At the armistice, 57,508 officers and men served in the Air Service of the AEF, 24,512 in the Zone of Advance, and 32,996 in the Services of Supply. Of its 6,861 officers, 4,088 were on flying status and 219 were qualified observation balloon aviators. 1,724 of those on flying status and approximately 100 of the balloonists served in combat units.
Major General Robert Young, was a dentist, volunteer soldier, World War I brigade commander and professional soldier in the New Zealand Military Forces.
The VII Corps Observation Group was an Air Service, United States Army unit that fought on the Western Front during World War I as part of the First Army Air Service. It was later transferred to the Third Army Air Service as part of the United States Occupation of the Rhineland after the 1918 Armistice with Germany.
Avery D. Andrews was an officer in the United States Army and a corporate attorney and executive. He was most prominent for his service as a brigadier general on the staff of the American Expeditionary Forces headquarters during World War I.
Stevedore operations were established by the United States Army to provide movement of supplies through ports in support of the American Expeditionary Forces during World War I. The first American stevedores in France were civilians. Stevedores were originally organized into regiments, and were among the first troops sent to France. Three regiments and two separate battalions were deployed, and were later reorganized into separate battalions and transferred from the Army Service Corps to the Transportation Corps. The battalions were inactivated in France and the troops were assigned to companies without a branch affiliation for their return to the U.S.
Henry Dallas Linscott was a decorated officer of the United States Marine Corps with the rank of lieutenant general. He is most noted for his service on the staff of Amphibious Force Commander, Admiral Richmond K. Turner during World War II and later as the commanding general of the Department of the Pacific and Camp Lejeune.
United States 
