Israel and South Africa co-operated closely on the joint BVR missile programme that delivered the Derby, and the essentially identical R-Darter (also known as V4) to South Africa.

• 以色列和南非在联合超视距导弹项目上的合作相当紧密，从而产生了德比导弹，南非的R-标枪手（也就是人们所说的V4）导弹从本质上来说与其完全相同。