counter the threat. Tank armour soon developed beyond the point at which an anti-tank rifle could practically be carried by an infantryman, and by the Second World War rocket weapons such as the US bazooka and German Panzerschreck were in service. Development continued after the war, with weapons such as the RPG-7, although a need to increase range led to the development of guided weapons to fulfill the anti-tank role. Most modern armies now use guided missiles for long-range engagements and rockets for close-range or emergency use; disposable weapons such as the RPG-26 are popular for this. The use of anti-tank weapons to attack buildings and other targets has led to the development of weapons and ammunition designed specifically to attack non-tank targets, such as the one-shot LASM and the larger SMAW. Air-launched Unguided rockets are a widely used weapon system and have been launched from aircraft since the early 20th century, to attack land, sea and air targets. Even after the development of guided missiles, rockets remain useful for short-range attacks – typically for close air support missions. The standard NATO calibre is 70mm and is considered as the international calibre. The rockets can be fired from a variety of rotary and fixed-wing platforms and combat aircraft of many nations worldwide by means of a rocket launcher. The 70mm rocket system offers several warhead configurations that fulfill a wide range of special mission requirements to defeat soft to lightly armored targets. See also Hydra 70 CRV-7 Yarmuk S-5 rocket S-8 rocket S-13 rocket Ugroza Advanced Precision Kill Weapon System (APKWS) References Missile types