destroyer reintroduces the tumblehome hull form, a hull form not seen to this extent since the Russo-Japanese War in 1905. It was originally put forth in modern steel battleship designs by the French shipyard Forges et Chantiers de la Méditerranée in La Seyne, Toulon. French naval architects believed that tumblehome, in which the beam of the vessel narrowed from the waterline to the upper deck, would create better freeboard, greater seaworthiness, and, as Russian battleships were to find, would be ideal for navigating through narrow constraints (e.g., canals). On the downside, the tumblehome battleships leaked – partly due to their riveted construction – and could be unstable, especially when turning at high speed. The tumblehome has been reintroduced in the 21st century to reduce the radar return of the hull. The inverted bow is designed to cut through waves rather than ride over them. The stability of this hull form in high sea states has caused debate among naval architects, with some charging that "with the waves coming at you from behind, when a ship pitches down, it can lose transverse stability as the stern comes out of the water—and basically roll over." Advanced Gun System The Advanced Gun System is a 155 mm naval gun, two of which are installed in each ship. This system consists of an advanced 155 mm gun and its Long Range Land Attack Projectile (LRLAP). This projectile is a rocket with a warhead fired from the AGS gun; the warhead has an 11 kg / 24 lb bursting charge and has a circular error probable of 50 meters. This weapon system has a range of . The fully automated storage system has room for up to 750 rounds. The barrel is water-cooled to prevent overheating and allows a rate of fire of 10 rounds per minute per gun. Using a Multiple Rounds Simultaneous Impact (MRSI) firing tactic, the combined firepower from a pair of turrets gives each Zumwalt-class destroyer initial strike firepower equivalent to 12 conventional M198 field guns. The Zumwalts use ballast tanks to lower themselves into the water for a reduced profile in combat. In November 2016, the Navy moved to cancel procurement of the LRLAP, citing per-shell cost increases to $800,000–$1 million resulting from trimming of total ship numbers of the class. Since the AGS was tailor-made to use the LRLAP, it was unable to fulfill the naval gunfire support role