The Vympel R-27 (NATO reporting name AA-10 Alamo) is a family of air-to-air missile developed by the Soviet Union. It remains in service with the Russian Air Force, air forces of the Commonwealth of Independent States and air forces of many other countries as standard medium range air-to-air missile even though they have the more advanced R-77. The R-27 is manufactured in infrared-homing (R-27T, R-27ET), semi-active-radar-homing (R-27R, R-27ER), and active-radar-homing (R-27EA) versions. R-27 family missiles are produced by both Russian and Ukrainian manufacturers. The R-27 missile is carried by the Mikoyan MiG-29 and Sukhoi Su-27 family fighters. The R-27 missile is also license-produced in China, though the production license was bought from Ukraine instead of Russia. Variants R-27R: AA-10 Alamo-A, semi-active radar homing. Missile can be used at 20 to 25,000 meters altitude (launch platform or target). Effective kill range for a target at same altitude: 2 to 42.5 km head-on, 0.7 to 7.5 km tail-on. Maximum range: 73 km. Maximum allowed vertical separation between target and launch platform: +/− 10 km. R-27R1: Export model of the R-27R. The missile has a maximum range of with 39 kg warhead. R-27T: AA-10 Alamo-B, infrared homing, passive homing using the Avtomatika 9B-1032 (PRGS-27) IR seeker head. Missile can be used at 20 to 25,000 meters altitude. Effective kill range for a target at same altitude: 2 to 33 km head-on, 0 to 5.5 km tail-on. Maximum range: 63 km. Maximum allowed vertical separation: +/−10 km. R-27T1: Export model of the R-27T. The missile has a maximum range of with 39 kg warhead. R-27ER: AA-10 Alamo-C, the semi-active-radar homing extended-range version. Missile can be used at 20 to 27,000 meters altitude. Effective kill range for a target at same altitude: 2 to 65.5 km head-on, 0.7 to 16.5 km tail-on. Missile cannot be fired at altitude less than 3 km against a target with background earth, if launch range is less than 6 kilometers. Maximum range: 117 km. Maximum allowed vertical separation: 12 km. R-27ER1: Export model of the R-27ER. The missile has a maximum range of with 39 kg warhead. R-27ET: AA-10 Alamo-D, the infrared-homing extended-range version, Weight 348 kg. Missile can be used at 20 to 27,000 meters altitude. Effective kill range: 2 to 52.5 km head-on, 0.7 to 12.5 tail-on. Maximum range: 104 km. Maximum allowed vertical separation: 12 km. R-27ET1: Export model of the R-27ET. The missile has a