In September 1987, Hughes was awarded a development contract for the BGM-71F TOW 2B, which eventually entered service in 1992, after limited production had begun in 1990. The main new feature is the Overflight Top Attack (OTA) capability. The TOW 2B has a completely redesigned nose section, which includes two downward sequentially fired tantalum EFP (Explosive Formed Projectile) warheads, and an active dual-mode (optical laser/magnetic sensor) fuze. The laser and magnetic fuze work together to detect the height profile and the large metal mass of a tank, detonating the warheads exactly above the target. The guidance system is also updated, flying the missile at a preset height above the operator's line of sight, so that the latter can still point his cross-hairs directly at the target. The BGM-71F does not replace but supplement the BGM-71E. The designation