Thermobaric rockets can be carried by a single infantry soldier in addition to their normal weapon, but the rockets are so powerful they can destroy some buildings in a single shot. America's main thermobaric rocket is the SMAW-NE. The Shoulder-launched Multi-purpose Assault Weapon-Novel Explosive fires a rocket that disperses a mist of metal and fuel. The chemicals then react with the oxygen in the air before exploding.
The resulting blast is strong enough to take out many small buildings, even those built with stone and heavy beams. The weapon is mostly used by the Marine Corps and was deployed during the Second Battle of Fallujah.
Of course, America isn't the only country with thermobaric rockets. Russians use the Shmel-M. In the Russian military, thermobaric weapons are called, "flamethrowers," but the rockets work the same way. The Shmel-M is actually a descendant of the Schmel, the first deployed thermobaric weapon.
Thermobaric weapons also come in the form of a bomb or grenade.