Shturmovik

The Shturmovik is the third best Offensive armor overall.

Related Jobs
Another item with the same name can currently be obtained from the Vory job, "Rob A Troop Convoy" in Episode 4, Chapter 2 of the Moscow expansion.

Moscow Preview
During the Moscow Preview event, it could be obtained by getting all eight Russian Mafia Promotional Loot items. These were:

Weapons:
 * .45 ACP Pistol
 * Dragunov
 * Grach
 * IZH-35m
 * PPSH 41 Submachine gun
 * VSK-94 Sniper Rifle

Armor:
 * Ushanka

Vehicles:
 * Impression