The in the Japan Maritime Self-Defense Force is a modified version of the , with an updated Aegis Combat System and electric propulsion system. Maya was commissioned on March 19, 2020. Haguro was commissioned on March 19, 2021. Background The Maritime Self-Defense Force (MSDF) began construction of the Aegis-equipped in FY1988. In FY2002 and 2003, a modified version, , was also added for its fleet. However, even after the four Kongō-class and two Atago-class destroyers had been commissioned, it was still necessary to build two more Aegis-equipped destroyers to replace , the best and last survivor of Tartar-equipped destroyers. The construction of these two Aegis-equipped destroyers was included in the National Defense Program Guidelines for FY2014 and beyond. The first ship, JS Maya, was built in the FY2015 budget. Design While it shares the same design characteristics as the Atago class, the Maya class possesses a larger hull to install a hybrid-electric propulsion system. Maya-class destroyers are engineered with a COGLAG (Combined Gas turbine-eLectric And Gas turbine) propulsion system, a modification of the combined gas and gas propulsion system employing electric propulsion for low-speed cruising. The JMSDF had been testing a COGLAG propulsion system on JS Asuka. Then, the adoption of the system for surface combatants began with the . While the Asahi class system had a low voltage distribution of 450 volts, the Maya class system is equipped with a more advanced system that can handle a high voltage distribution of 6,600 volts. The JMSDF already uses an integrated electric propulsion system for auxiliary vessels and is expected to expand to surface combatant ships in the future in light of its future weapon accommodation. Equipment The Maya class features the newer Aegis Weapon System (AWS) Baseline 9C (referred to as J7 in Japan), compared with the Atago class using the Baseline 7 system (now being updated to Baseline 9C with modernization). With this system, these destroyers are equipped with the Cooperative Engagement Capability (CEC) system. This will allow the ship to share surveillance or targeting information with other CEC-equipped assets, such as ships from the American or Australian Navy or from American or Japanese E-2 Hawkeyes. In addition to the AWS, they are also equipped with an Aegis BMD 5.1 system; they are the first JMSDF Aegis vessels to be capable of ballistic missile defense (BMD) from the time of its commissioning. In addition to the existing SM-2MR Block