In September 1987, Hughes was awarded a development contract for the BGM-71FTOW 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.