SSB- Services Selection Board (This SSB App can also be used for other competitive exams as it has Daily Aptitude tests and Daily Current Affairs. It can be used for various UPSC tests.) SSB Interview App is specifically made for Defence aspirants who would like to join the defence forces as an officer. SSB Interview is a 5-day interview process where the future officers of the Indian Armed Forces are selected. SSB Interview App is complete Defence SSB Guide having the following sections: 1.