Police Quest - SWAT
Sierra On-Line introduces a great game named as Police Quest: SWAT is an Adventure-based, Strategy and Single-player Simulation.
2 Alternatives To Police Quest - SWAT
Jagged Alliance 2
Jagged Alliance 2 is one of the older tactical role playing games.
Xenonauts
Xenonauts attracts greatly on the sci-fi universe of the original X-COM to make a very familiar turn based tactical adventure.