context: In the Second Polish Republic, Adam Koc first was incorporated into the Polish Armed Forces, in December 1919, where he was given command of the 201 Infantry Regiment of Warsaw's Defense, which later became a Volunteer Division (31 July - 3 December 1920). Afterwards, he served in the Ministry of Military Affairs, in different positions. A participant in the May Coup, he was promoted in 1926 to be chief of the Command of VI District of Corps in Lwów, a position he held until 1928.
question: When did Adam Ignacy Koc join the military?
answers.text: 1919 December 1919