be on full standby at any given time, shortening the warship's response time before firing. The original five ships (Ticonderoga, Yorktown, Vincennes, Valley Forge, and Thomas S. Gates) had Mark 26 twin-arm launchers that limited their missile capacity to a total of 88 missiles and could only fire the SM-2MR and RUM-139. After the end of the Cold War, the less capable original five warships were limited to duties close to the home waters of the United States. A standard VLS loadout for a Ticonderoga cruiser as of 2018 is 12 SM-6s, 3 SM-2ERs, 56 SM-2MRs, 12 RIM-162 ESSMs, 10 SM-3s, 32 Tomahawks, and 6 RUM-139s. In addition, Ticonderogas carry 8 Harpoon anti-ship missiles in standalone launchers at the fantail of the ships. Upgrades Originally, the U.S. Navy had intended to replace its fleet of Ticonderoga-class guided-missile cruisers with cruisers produced as part of the CG(X) missile cruiser program; however, severe budget cuts from the 21st-century surface combatant program coupled with the increasing cost of the destroyer program resulted in the CG(X) program being canceled. The Ticonderoga-class cruisers were instead to be replaced by Flight III destroyers. All five of the twin-arm (Mk-26) cruisers have been decommissioned. In 2003, the newer 22 of the 27 ships (CG-52 to CG-73) in the class were upgraded to keep them combat-relevant, giving the ships a service life of 35 years. In the years leading up to their decommissioning, the five twin-arm ships had been assigned primarily home-waters duties, acting as command ships for destroyer squadrons assigned to the eastern Pacific and western Atlantic areas. As of July 2013, two cruisers have completed hull, mechanical, and electrical (HM&E) upgrades, and eight cruisers have had combat systems upgrades. These include an upgrade of the Aegis computational system with new computers and equipment cabinets, the SPQ-9B radar system upgrade introducing an increased capability over only gunfire control, optical fiber data communications and software upgrades, and modifications to the vertical launching system allowing two 8-cell modules to fire the RIM-162 ESSM. The most recent upgrade packages include SM-6 and Naval Integrated Fire Control – Counter Air (NIFC-CA) capability. Another upgrade is improving the SQQ-89A(V)15 sonar with a multi-function towed array. Hull, sonar, radar, electrical, computer, and weapons systems upgrades can cost up to $250 million per ship. Service Downing of Iran Air Flight 655 USS Vincennes (CG-49) achieved notoriety in 1988 when, amid a running gun battle