One of India's most capable new surface combatants was commissioned into service on 29 April. The Shivalik is the first of a new class of Project 17 guided-missile frigates that incorporates signature-reduction measures, causing local media to dub the frigate India's first domestically produced "stealth" warship. The 6,200-ton (full load) Shivalik was built by Mazagon Dockyard of Mumbai and launched on 18 April 2003. The Shivalik began sea trials in 2009, and at least two additional sister units, the Satpura and Sahyadri , are currently under construction and expected to enter service by 2011. More frigates are planned for the future, and last summer India inked a deal for seven follow-on warships built to a modified design known as Project 17A.