The EA-6B Prowler is a twin-engine, mid-wing aircraft manufactured by Grumman (now Northrop Grumman Aerospace) as a modification of the basic A-6 Intruder airframe. The Prowler has a crew of four, a pilot and three Electronic Counter-measures Officers (known as ECMOs). Powered by two non-afterburning Pratt & Whitney J52-P408 turbojet engines, it is capable of speeds of up to 950 km/h (590.3 miles per hour) with a range of 1,840 kilometers (1,143.3 miles). Since EW operations are very demanding, the Prowler is a high-maintenance aircraft and also undergoes more frequent equipment upgrades than any other aircraft in the Navy.