These boats can be outfitted with AEGIS/SM-3 missiles
LCS-1 is approximately 800 tons overweight in her current configuration due to the switch by L-M from aluminum to steel in the construction of the hull and superstrucure. LCS-2 is underweight and has growth potential.
Neither of these ships can take the SM-2/SM-3 Standard missile systems because the Mk 41 VLS is too large and heavy.
Both LCS-1 and LCS-2 were supposed to mount the NLOS-LS (Non-Line Of Sight Launch System) missiles being developed by the US Army. NLOS-LS is a collection of vertical launch modules that fire the 117-pound missile. Range is 40 km and designed to attack targets afloat or ashore. Guidance is by GPS, semi-active laser, or imaging infrared. Warheads have three different fuzing modes for attacking structure, soft, or armored targets.
The problems with the LCS designs are too numerous to describe here. But, the LCS really needs more and longer range anti-air warfare missiles such as the Evolved Sea Sparrow Missile (ESSM) in the light weight bolt-down Mk 56 vertical launch modules.
The current Mk 49 launcher for 19 RIM-116 Rolling Airframe Missiles is too bulky and heavy. It should be removed and replaced with one each of the Mk 15 Mod 0 Block 1B 20mm Phalanx CIWS (Close-In Weapon System) and the SeaRAM (replaces the CIWS 20mm gun with an 11-round RIM-116 missile cell). Both CIWS and SeaRAM are bolt-down applications and don't require major alterations to the ship.