Blaster small arms come in a range of sizes, from small hand-held blasters to carbines and larger laser rifles. Some are equipped with features such as a targeting scope or flash and noise suppressor. Others are highly customizable like the A300 blaster rifle used by Rebel commandos on Scarif, with a removable shoulder stock, swappable barrels of different sizes, and other attachments. Certain modifications however are considered inhumane and banned on civilized worlds: the Trandoshan doubler or tripler when added to the barrel of a blaster pistol turns it into a devastating hand cannon. Crew-served blasters also exist, an example being the E-web heavy repeating blaster deployed by snowtroopers on Hoth. The most powerful repeating blaster employed by the Empire, the weapon requires a crew of two to set up its power generator and a rigid mount to counteract the fearsome weapon's recoil. Larger versions of blaster weaponry in the Star Wars universe are referred to as blaster cannons and laser cannons and commonly found on vehicles, starfighters and other spacecraft. Of the two laser cannons are considered more powerful and possess greater range. The laser cannons on a Republic LAAT gunship, as an example, can fire bolts of up to five gigajoules in destructive power. Laser cannons may also be fitted on fixed emplacements to defend an area from attack, like the Golan Arms DF.9 anti-infantry battery employed by Rebel defenders at the Battle of Hoth. These cannons have an effective range of and can take out an entire squad of infantry with a single blast. A more powerful form of the laser cannon is the turbolaser found on Star Wars capital ships, operating on the same principles but with larger power generators and multiperson crews. Such weapons can be used to penetrate the defenses of other capital ships or conduct planetary bombardments. Turbolasers can vary their power intensity depending on the needs of the mission, from simply crippling a target to outright vaporizing it, with true warships like the Venator-class Star Destroyer able to feed nearly their entire reactor output into its heavy turbolasers. With this weaponry, a fleet of warships can reduce the upper crust of a planet to molten slag as part of a "Base Delta Zero" bombardment. Analysis A laser is a device which emits a beam of coherent light at a target. Controlling or containing the direction of light energy is also known as