Rocket Assisted Projectile
From Gunsopedia
A Rocket Assisted Projectile is an artillery or cannon round incorporating a rocket motor for independent propulsion. This grants the projectile both greater speed and range than an ordinary shell, which is propelled only by the ballistic force of the gun's exploding charge. On some forms of Rocket Assisted Projectiles, they are sometimes outfitted with a laser-guide for greater accuracy.
When NATO standards required member armies to have corps-level artillery that could fire to a maximum range of 30 Km (18.6 mi), nearly all member nations solved the problem with RAP rounds in their 155 mm (6.1 inch) artillery. The Belgian Army was the only NATO member army that did not require RAP, reaching the required range with a conventional round.
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