The Sparrow was also used as the basis for a surface-to-air missile, the RIM-7 Sea Sparrow, which is used by a number of navies for air defense of their ships. Fired at low altitude and flying directly at its target through the lower atmosphere, the range of the missile in this role is greatly reduced. With the retirement of the Sparrow in the air-to-air role, a new version of the Sea Sparrow was produced to address this concern, producing the much larger and more capable RIM-162 ESSM.