The Littoral Combat Ship (LCS) is a relatively inexpensive Navy surface combatant equipped with modular “plug-and-fight” mission packages. The Navy wants to field a force of 55 LCSs. Twelve LCSs have been funded through FY2012, and the FY2013-FY2017 Future Years Defense Plan (FYDP) calls for procuring 16 more, in annual quantities of 4-4-4-2-2.
https://www.scribd.com/doc/124049639/Navy-Littoral-Combat-Ship-LCS-Program-Background-Issues-and-Options-for-Congress