India has completed its nuclear triad by inducting the first indigenously built strategic nuclear submarine INS Arihant into service.
SSBNs are designed to prowl the deep ocean waters and carry nuclear weapons.
Kamov 226T is a light multipurpose helicopter designed for work in difficult conditions like high mountains, hot climate and marine areas.
An S-400 'Triumf' long-range air defence missile system is one of the most advanced long-range defence systems in the world. It is referred to as SA-21 Growler by NATO.