(1) The serving of punishment by imprisonment shall be accompanied by appropriate, duly paid socially useful labour, for the purpose of re-education of the convicts and formation and upgrading of their vocational qualifications. (2) Further to the above also other measures for education and training shall be applied. (3) The labour performed shall be recognised as a way of diminishing the term of the punishment, two work days being recognised for three days of imprisonment. (4) (Supplemented, SG No. 28/1982, amended, SG No. 89/1986) Where the sentenced person in serving the punishment by imprisonment systematically avoids doing socially useful work, commits deliberate crime, or grave offences of the established order and thereby shows that he does not correct himself, the court may revoke entirely or in part the recognition of his work days for the last two years prior to the perpetration of the last offence. (5) (Repealed, renumbered from Paragraph 6, SG No. 89/1986) The procedure and manner of serving the punishment by imprisonment and the special care under paragraph (3) of Article 40, the payment of the labour of convicts, as well as their appointment to jobs after their release, shall be regulated by law. (6) (Amended, SG No. 89/1974, renumbered from Paragraph 7, SG No. 89/1986, amended, SG No. 27/2009, effective 1.06.2009, SG No. 13/2017, effective 7.02.2017) The initial regime of serving punishment by imprisonment shall be determined by the court in compliance with the provisions of this Code and the special law. Article 42 (1) In time of war the military court may suspend to the end of military operations the serving of imposed punishment by imprisonment, by sending the convict to the field army. The suspension of serving the punishment may be revoked, if the convict commits a new crime. (2) At the proposal of his commander the court may, entirely or in part, exempt the convict sent to the field army, pursuant to paragraph (1), from serving the imposed punishment, if he proves to be good defender of the fatherland. (3) The court may, even without the proposal of his commander, exempt the convict discharged from the field army due to invalidity, from serving the imposed punishment. Article 42a (New, SG No. 92/2002 - effective 1.01.2005 - amended, SG No. 26/2004, effective 1.01.2004) (1) (Amended, SG No. 103/2004, effective 1.01.2005) Probation is a system of non-custodial measures for control and intervention that shall be imposed separately or collectively. (2) (Amended, SG No. 103/2004, effective 1.01.2005) Probation measures shall be: 1. Compulsory registration at the current address; 2. Mandatory regular appointments with a probation officer; 3. Restrictions on free movement; 4. (Amended, SG No. 75/2006) Admission to vocational training courses, public intervention programmes; 5. Corrective labour; 6. Community service. (3) (Amended, SG No. 103/2004, effective 1.01.2005) Probation measures shall have the