Artur Sirk joined the Estonian Demobilised Soldiers League upon its formation in 1921 which led to him starting the Vaps Movement.
Sirk joined Eesti Demobiliseeritud Sojavaelaste Liit (Estonian Demobilised Soldiers League) upon its formation in 1921 and its successor movement, Eesti Vabadussojalaste Liit (Union of Participants in the Estonian War of Independence), being appointed deputy chairman of the latter group at its inaugural general meeting on 10 October 1926. Both of these groups had little ambition beyond being ex-servicemen's associations however Sirk desired a more centralised structure and to this end he established the Eesti Vabadussojalaste Keskliit, or Vaps Movement as it became known, in 1929. 
