Adapted from a light skiff commonly employed by forces of the South American Allied nations' Coast Guard, the Allies' hydrofoil is a fast-moving vessel designed for surveillance and defensive operations. It features a fast-firing 20 mm close-in weapons system well-suited for engaging low-flying enemy aircraft, although its facing limits the weapon to a pure anti-air role. However, the hydrofoil gains versatility thanks to its Scramblegun weapon jammer, an electromagnetic beam that draws upon the hydrofoil's advanced computers and fuel reserves to temporarily disable most known weapons systems on an individual, nearby target. Thus, while the hydrofoil is not equipped to fend off a full-scale naval invasion, it can adequately fend for itself and provides invaluable support as part of a naval strike group.
You can read the full article, along with a short video of this unit in action here, at RedAlert3.com.