Law 569/75 regulates military service, which is compulsory according to art. 129 of the 20 June 1992 Paraguayan constitution.  
All men aged 18 to 50 are liable for military service. They must take an oath of obedience to the armed forces and the national police. 
Military service lasts for one year, and two years in the navy. 
High school students are allowed to perform their service in two five week stages.