General Dynamics Electric Boat Corp., Groton, Conn., is being awarded a $429,162,324 modification to previously awarded cost-plus-fixed-fee contract (N00024-11-C-2111) to exercise an option for design agent, planning yard, engineering ,and technical support for active nuclear submarines. This contract will be incrementally funded with $8,333,669 to be obligated at the time of award. Work will be performed in Groton, Conn. (73 percent); Kings Bay, Ga. (11 percent); Bangor, Wash. (8 percent); Quonset, R.I. (6 percent); and Newport, R.I. (2 percent). Work is expected to completed by October 2012. If fully funded, contract funds in the amount of $186,513,732 will expire at the end of the fiscal year. Naval Sea Systems Command, Washington, D.C., is the contracting activity.