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Here we go...
http://www.designation-systems.net/dusrm/m-66.html
"SM-2 (Standard Missile 2) was developed as the missile component of the U.S. Navy's Aegis fleet air defense system. The SM-2 missile uses semi-active radar homing only in the terminal intercept phase, and has a new inertial guidance unit and a new programmable MK 2 autopilot to guide it near the projected point of intercept. On Aegis ships, this autopilot is command-guided to the target by the launching ship, which can track multiple targets with the Aegis' powerful AN/SPY-1 radar (current version is AN/SPY-1D). When used on earlier Tartar ships, SM-2 uses pre-launch settings and its inertial guidance system to find its way to the target. Not needing SAR guidance through all its flight-path, effective intercept range of the SM-2MR is 60 percent greater than for the SM-1MR. The command guidance allows a more energy-efficient flight path, and the illuminator radar (e.g. AN/SPG-62) can provide effective illumination at almost doubled target ranges (because illumination immediately after launch is especially power-demanding, when the radar beam has to travel all the distance from ship to target and back). A further improvement in the SM-2 is the new monopulse seeker for terminal homing, which provides better ECM resistance."
"SM-2MR Block II introduced an improved Thiokol MK 104 rocket motor, to deal with faster and more manoeuverable targets. The effective range is almost doubled, reaching the limits of illuminator power. Block II also has a new high-velocity fragmentation warhead. The RIM-66G is the Aegis version, RIM-66H is for vertical launch on Aegis ships with MK 41 VLS (Vertical Launch System), and RIM-66J is for Tartar ships. SM-2MR Block II entered service in 1983."
"SM-2MR Block III introduced an improved MK 45 MOD 9 TDD (Target Detecting Device) for better performance against low-altitude targets. Block III A has a new MK 125 warhead with heavier grain explosive, and Block III B (for Aegis/VLS only) incorporates an MHIP (Missile Homing Improvement Program) combined radar/IR seeker for terminal homing. The IR sensor is in a side fairing of the missile. The MHIP seeker was also intended for the cancelled AIM/RIM-7R Sparrow missile. The designation RIM-66K applies to Tartar system missiles (RIM-66K-1 Block III, RIM-66K-2 Block III A), RIM-66L is the Aegis missile (RIM-66L-1 Block III, RIM-66L-2 Block III A), and RIM-66M is the Aegis missile for the MK 41 VLS (RIM-66M-1 Block III, RIM-66M-2 Block III A, RIM-66M-5 Block III B). Block III production began in 1988, with the Block III A following in 1991. Blocks III A and B are the current production versions."
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