Original Item: Only One Available. This is a very nice WWII Issue U.S. Marine Corps Officer’s Campaign Hat, often called a "Drill Instructor Cover" or “Smokey Bear” in the USMC Today. However, it wasn't until 1956 that these were made the official head wear of Marine Corps Drill instructors, and during WWII they were worn by various different types of personnel, depending on need and location.
 
This nice medium size of about 56cm, is a WWII issue example is very nice, and is made of pressed OD Green felt, which is still quite stiff around the brim. The front crown of the cap of course has a correct WWII issue large U.S. Marine Corps EGA bronze screw back pin, which retains little of the original blackened finish. It also still has the original band around the outside, used to hide the stitches that attached the liner. The yellow and red officer’s cord around the outside is in excellent condition. The leather chinstrap and leather sweatband are both in good condition but cracked due to age and wear. On the inside of the cap, around the screw back of the EGA is the name of the Marine or Marines this was issued to:

Sanders
A.B. Gross
Berun(?)

The markings on the liner are:
“Hat, Service, Field”
PQMD-277-H-4321
CONTR. No. 3889RS-1944
 
A very nice WWII USMC Campaign Hat, ready to display!
 
The origins of the hat can be traced to the 1840s when U.S. Army mounted troops posted to the far-west sometimes wore wide-brimmed civilian hats, which were more practical than the regulation shakos and forage caps then issued. The crease was influenced by the designs of the sombreros worn by the Mexican Vaqueros. The name started to be used after the 1872–1876 regulations, which introduced a black felt hat—which could be drab after 1883—for fatigue use derived from the types popularized during the American Civil War. Some were worn with campaign cords, mainly as a form of decoration.

At least as early as 1893, hats of the Stetson Boss of the Plains type were being creased into pointed tops by British South Africa Company (BSAC) scouts in Africa. When designing the iconic uniform for Boy Scouts, Baden-Powell drew on the hat worn by Frederick Russell Burnham, the celebrated American scout, during his service as Chief of Scouts in the BSAC and the British Army in the 1890s. The 1,200 Canadian troops serving under Baden-Powell were the first to wear the campaign hat as a part of their official uniform, and this very likely influenced Baden-Powell's decision to order 10,000 of the hats for the British troops.

A version of the hat, with a crease along the top of the crown, was worn by some US Army troops during the Spanish–American War. The army officially adopted the "Montana peaked" design as a service hat on 8 September 1911.

Through the World War I era, the campaign hat worn by American soldiers was fairly soft. Those worn by the United States Army's general officers had a golden cord around it, whereas other commissioned officers had a golden-and-black campaign cord around their hat. Field clerks, as well as their post-war successors the warrant officers, had a silver-and-black cord, while other ranks had cords in their branch-of-service colors. The United States Marine Corps had the Eagle, Globe, and Anchor badge in black at the front of their campaign hats; its officers had an additional golden-and-scarlet cord around their hat, whereas its other ranks had none.
By the 1930s the felt was made very stiff with a permanently flat brim. Due to the frequent wearing of helmets in France in World War I, most troops received a copy of the French bonnet de police that became known as the overseas cap. From 1940 onwards, the campaign hat was replaced by the much cheaper American fiber helmet. In 1942 the campaign hat ceased to be issued generally, but it was still commonly found in the Pacific theatre for much of the war, and was the trademark of General Joseph Stilwell.

Today’s Use
The hat worn by male United States Army drill sergeants is olive drab in color with a golden Great Seal of the United States on a disc centered on the front (infantry drill sergeants have a blue disc behind the seal); this is the same insignia as traditionally worn on the Service Cap and the Dress Cap. Female drill sergeants in the Army do not wear a campaign hat but instead wear a hat resembling an Australian bush hat. Originally beige in color, in 1983 the color was changed to green with the style remaining unchanged.
The 133rd Field Artillery Regiment of the Texas Army National Guard wears the Fort Sill style Artillery Campaign Hat during formal functions, such as the annual Saint Barbara's Day Ball.

Male and female United States Marine Corps drill instructors and Primary Marksmanship Instructors wear similar campaign hats with a matte black Eagle, Globe, and Anchor centered on the front; the same insignia is worn on their olive drab combination hats. While US Marine Corps officers wear a scarlet and gold cord around the hats and generals wear a solid gold cord, enlisted Marines no longer wear cords around the hats. The US Marine Corps campaign hats were introduced on 20 July 1956.

Male United States Air Force military training instructors (MTIs) wear dark blue hats with the Great Seal of the United States within a ring, in silver color, again centered on the front; this is the same insignia as worn on their service cap. Female MTIs wear an Australian style dark blue bush hat. Air Force MTIs in the top ten percent of their career field wear a light blue cord and are more likely to be referred to as "Blue Ropes" than MTIs.

US Coast Guard recruit training company commanders (USCG-USN counterpart to drill instructors) wear a navy blue version with a black cord; the insignia worn is the same as worn with the combination cover.
The United States Navy is the only US armed force not to use the campaign hat. Their recruit division commanders wear normal prescribed hats for their uniforms, with a red aiguillette on their shoulder to show their status.