Question: In what army is Mehmetçik slang for a common a common soldier?

Context paragraphs:
Just a Common Soldier: Just a Common Soldier, also known as A Soldier Died Today, is one of the most popular poems on the Internet

Respect to Mehmetçik Monument: The Respect to Mehmetçik Memorial (Turkish: "Mehmetçiğe Saygı Anıtı" ) is a monument in the Gallipoli peninsula, Turkey.  Mehmetçik is a common name given to soldiers in a war, just like G.I..

Mehmetçik Monument: Mehmetçik Monument (Kartaltepe Mehmetçik Monument) is a monumental sculpture featuring a Turkish soldier on Kartaltepe of Polatlı, a rural area of Ankara Province, Turkey.  The name of the monument "Mehmetçik" is the diminutive form of the common name Mehmet, which is used to nickname Turkish soldiers.

Catherine Exley: Catherine Exley (born Whitaker) was the wife of a soldier and accompanied her husband when he served in Portugal, Spain and Ireland during the Napoleonic Wars.  She is best known as the author of a diary that gives an account of military life in that era from the viewpoint of the wife of a common soldier.

Internet slang: Internet slang (Internet shorthand, cyber-slang, netspeak, or chatspeak) refers to a variety of slang languages used by different people on the Internet.  An example of Internet slang is "codice_1" meaning "laugh out loud".  It is difficult to provide a standardized definition of Internet slang due to the constant changes made to its nature.  However, it can be understood to be a type of slang that Internet users have popularized, and in many cases, have coined.  Such terms often originate with the purpose of saving keystrokes or to compensate for small character limits.  Many people use the same abbreviations in texting and instant messaging, and social networking websites.  Acronyms, keyboard symbols and abbreviations are common types of Internet slang.  New dialects of slang, such as leet or Lolspeak, develop as ingroup internet memes rather than time savers.

A. Lawrence Vaincourt: A. Lawrence Vaincourt was a Canadian writer best known for the poem "Just a Common Soldier", also known as "A Soldier Died Today".

Tommy Atkins: Tommy Atkins (often just Tommy) is slang for a common soldier in the British Army.  It was certainly well established during the nineteenth century, but is particularly associated with World War I.  It can be used as a term of reference, or as a form of address.  German soldiers would call out to "Tommy" across no man's land if they wished to speak to a British soldier.  French and Commonwealth troops would also call British soldiers "Tommies".  In more recent times, the term Tommy Atkins has been used less frequently, although the name "Tom" is occasionally still heard, especially with regard to paratroopers.

Mehmetçik: Mehmetçik (literally: Little Mehmet) is a general term used affectionately to refer soldiers of the Ottoman Army and Turkish Army.  It is the Turkish equivalent of "Tommy Atkins" for the British Army, "Doughboy" or G.I. of the United States Army, "Digger" of the Australian Army and the New Zealand Army or Johnny Reb for Confederate soldiers in the American Civil War.  Although it is used for especially infantryman (foot soldier), terms such like Piyade Mehmetçik (Infantryman Little Mehmet) and Süvari Mehmetçik (Cavalryman Little Mehmet), Topçu Mehmetçik (Artilleryman Little Mehmet) have rarely been seen.

Joseph Plumb Martin: Joseph "Plumb" Martin (November 21, 1760 – May 2, 1850) was a soldier in the Continental Army during the American Revolutionary War, holding the rank of private for most of the war.  His published narrative of his experiences, re-discovered in the 1950s, has become a valuable resource for historians in understanding the conditions of a common soldier of that era, as well as the battles in which Martin participated.

Bigalı Mehmet Çavuş: Bigalı Mehmet Çavuş (1878–1964), (literally Sergeant Mehmet of Biga) was an Ottoman Army sergeant, who fought during the Gallipoli Campaign of World War I.  He is remembered for his bravery, and is considered to be the eponym of the common name "Mehmetçik" used for an Ottoman or a Turkish soldier.

Supporting paragraphs: Mehmetçik Tommy Atkins
Answer: Ottoman Army