Intti is a slang term referring to the Finnish Army

Finnish Army

The Finnish Army is the land forces branch of the Finnish Defence Forces.Today's Army is divided into six branches: the infantry , field artillery, anti-aircraft artillery, engineers, signals, and materiel troops.-History of the Finnish Army:Between 1809 and 1917 Finland was an autonomous part of...

, in particular to the compulsory national service

Conscription

Conscription is the compulsory enlistment of people in some sort of national service, most often military service. Conscription dates back to antiquity and continues in some countries to the present day under various names...

. The origin of the term stems from the fact that when the Finnish Army was founded, all property was marked by stamps reading "SA-INT", which stood for "Suomen Armeijan Intendentuuriosasto", or Finnish Army Commissariat

Commissariat

A commissariat is the department of an army charged with the provision of supplies, both food and forage, for the troops. The supply of military stores such as ammunition is not included in the duties of a commissariat. In almost every army the duties of transport and supply are performed by the...

. As the soldiers saw the stamp on all equipment, they began to refer to the army itself as intti. The SA-INT stamp itself has long since been replaced by a logo

Logo

A logo is a graphic mark or emblem commonly used by commercial enterprises, organizations and even individuals to aid and promote instant public recognition...

 in the shape of a castle tower, but the phrase has remained as a popular term amongst serving and discharged conscripts.

The US-Uncle Sam

Uncle Sam

Uncle Sam is a common national personification of the American government originally used during the War of 1812. He is depicted as a stern elderly man with white hair and a goatee beard...

 association and "GI" as a term denoting an American soldier derive from a similar route.