The computer-based command and decision element is the core of the Aegis combat system. This interface makes the Aegis combat system capable of simultaneous operation against a multi-mission threat: anti-air, anti-surface and anti-submarine warfare.

The Navy built the first Aegis cruisers using the hull and machinery designs of Spruance class destroyers. The commissioning of USS Bunker Hill (CG 52) opened a new era in surface warfare as the first Aegis ship outfitted with the Vertical Launching System (VLS), allowing greater missile selection, firepower and survivability. The improved AN/SPY-1B radar went to sea in USS Princeton (CG 59), ushering in another advance in Aegis capabilities. USS Chosin (CG 65) introduced the AN/UYK-43/44 computers, which provide increased processing capabilities.

In 1980, a smaller ship was designed using an improved sea-keeping hull form, reduced infra-red and radar cross section and upgrades to the Aegis Combat System. The first ship of the DDG 51 class, Arleigh Burke, was commissioned on the Fourth of July, 1991. The DDG 51 class was named after a living person, the legendary Adm. Arleigh Burke, the most famous destroyerman of World War II.

DDG 51s were constructed in flights, allowing technological advances during construction. Flight II, introduced in fiscal year 1992 (FY92), incorporates improvements to the SPY radar and the Standard missile, active electronic countermeasures and communications. Flight IIA, introduced in FY94, added a helicopter hangar with one anti-submarine helicopter and one armed attack helicopter.

Modernization of Aegis cruisers and destroyers is a top priority for Navy leadership. Combat System Architecture decisions for existing cruisers and destroyers are being made with the goal of separating software and hardware to create a networked computing environment. The Combat System software will also be componentized to enable reuse for in-service and new construction ships. The Aegis fleet modernization program encompasses a series of modifications and upgrades using Commercial Off-the-Shelf (COTS) networking and system infrastructures. Aegis Weapon System (AWS) and Aegis Combat System (ACS) modernization efforts will increase cruisers and destroyers capabilities against current and future threats, extend service life and increase interoperability.