[1] The SSI was created to support the DSI and the intervention group (IM) that previously did this work, and is therefore dedicated to the fight against terrorism and organised crime.

[1] These units have been specially trained to free hostages, apprehend dangerous individuals, dismantle gangs, penetrate and secure sensitive areas, and carry out punch actions.

[3] The mission of the SSI is,:[4][5] The SSIs are part of the elite units of the Algerian security forces, and the latter are directly trained in the DSI, which is none other than the equivalent of the GIGN in Algeria.

[1] To join the SSI, one must be a confirmed gendarme with a few years of service to his credit to be able to access the selection process which takes place at the DSI during 1 week.

They will have 60 hours of tests day and night, such as climbing a slippery and high facade of about 40m, they will have to implement their combat techniques learned in their schools, shooting, weapons handling, risk course etc.