In some countries labour battalions are a form of civil conscription instead of military conscription for people who cannot join military service for various reasons, e.g., due to bad health or being conscientious objectors to any forms of violence, as long as they aren't considered unfit for other work.Early in 1916 these began to also include men not assessed as fit enough to fight to carry out a similar role and were sometimes also known as Infantry Works Battalions.[3][4] Until the last days of the Soviet Union with obligatory military duty in the state, men deemed unfit to regular military duty but not unfit for other work, as well as many able-bodied ones, were assigned to construction battalions (стройбаты) of the Soviet Army.An interesting example are the Bulgarian Construction Troops (Строителни Войски), first established in 1920 to circumvent the limits on the size of the military imposed by the Treaty of Neuilly-Sur-Seine at the end of World War I.Over the years this branch became a blend of a corps of engineers and a means for some to fulfill the mandatory conscription in place during communism in the country.