On the proposal's due date, ship designs were submitted by Lockheed Martin, Austal USA, Huntington Ingalls Industries, and General Dynamics Bath Iron Works, and separate combat systems proposals were submitted by Lockheed, Raytheon, and General Dynamics Advanced Information Systems (GD AIS); ship and combat systems responses were limited to 25 and 15 pages respectively. Lockheed's response was a variant of their "Freedom"-class LCS; different upgrades included an advised increase in length to , vertical launch systems for Standard Missile 2 missiles or the Standard Missile 6, and the SPY-1F Aegis radar or an Air Missile Defense Radar derivative. Austal USA submitted a modified "Independence"-class ship, adding permanently installed systems like a towed array sonar, torpedoes, vertical launch anti-submarine rockets, and aviation capability to support the MH-60 helicopter in place of mission modules. Like Lockheed's submission, it has a VLS for Standard missiles, a 76 mm gun in place of the 57 mm gun, and can take on an Aegis or ADMR radar. Huntington Ingalls submitted a larger, more heavily armed National Security Cutter. General Dynamics also made an unspecified response.