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在掠飞攻顶弹药中，垂直于圆柱形载体的轴和飞行弹道安装战斗部。该圆柱形载体把一个几何制约体固定在常规轴对称战斗部上。该几何体限定了战斗部的直径、重量，因此也限定了它的杀伤力。非轴对称战斗部是一个增大掠飞攻顶弹药杀伤力的概念，它通过利用沿载体轴向的容积把更多的炸药装进战斗部，并把更大的动力加在目标上来实现。美国陆军武器装备研究、开发与工程中心（ＡＲＤＥＣ）在８０年代初开始研究非轴对称爆炸成形侵彻体（ＮＡＳＥＦＰ）战斗部。最初的ＮＡＳＥＦＰ战斗部是简单的二维轴对称战斗部设计，即是被截短并适配在规定的容积内。直到三维有限元计算机程序和复杂的三维药形罩制造技术成为可用时，才能从ＮＡＳ成型装药战斗部的结构形成气动力稳定具有杀伤力的ＥＦＰ。
In swept fly attacking ammunition, the warhead is mounted perpendicular to the axis of the cylindrical carrier and to the flight trajectory. The cylindrical carrier holds a geometric constraint on a conventional axisymmetric warhead. This geometry defines the diameter and weight of the warhead and thus also its lethality. The non-axisymmetric warhead is a concept that increases the lethality of a swept-fly attacking ammunition by loading more charge into the warhead with more volume in the axial direction of the carrier and adding more power to the target. The United States Army Armament Research, Development and Engineering Center (ARDEC) began its study of NASEFP warheads in the early 1980s. The original NASEFP warhead was a simple, two-dimensional axisymmetric warhead design that was truncated and fitted within a specified volume. Until the three-dimensional finite element computer program and the complex three-dimensional shaped mask manufacturing technology become available, the aerodynamically stable and lethal EFP can be formed from the structure of the NAS shaped charge warhead.