An interesting question Pstudio.

According to wiki, tactical is actually a subgenre of strategy. Strategy on it self therefor a bit difficult to place. Next to tactical, other sub-genres include: god games, city building, rts, simulation and even racing.

From Wiki:
Strategy games focus on careful planning and skillful resource management in order to achieve victory, and are therefore classified as "thinking games". These games may be turn-based or realtime, but there are some that mix the two types of play (such as X-Com). This genre has had a consistent following since the mid-1980s. Though a large portion of strategy games tend to be wargames, many are not based or focused on war. Common alternative foci are simulation and management of economic transactions, of building things, of managing large-scale affairs, etc.

Real-time Strategy
Usually applied only to certain computer strategy games, the moniker "real-time strategy" indicates that the action in the game is continuous, and players will have to make their decisions and actions within the backdrop of a constantly changing game state, and computer real-time strategy gameplay is characterised by obtaining resources, building bases, researching technologies and producing units.

Real-time Tactical
A different genre which focus on a set number of units, and do away with the resource gathering and unit production aspects of RTS games is real-time tactical, or RTT, games. Noteworthy examples are the fantasy Warhammer: Dark Omen game, one of the first purely RTT titles, the futuristic Ground Control, which distilled the combat operational aspects of Command & Conquer and Total Annihilation into a purely tactical form, the Close Combat series, where the player controls units in the Second World War, and the Total War series, reasonably realistically recreating empire building and epic battles in various historical eras. These games place greater emphasis on purely tactical aspects, contrasted to the production-economical focus of RTS games, and consequently have much more advanced facilities for operational-tactical unit control and planning and implementation of more advanced battlefield tactics, which is intentionally stylised, simplified and na?Øve in RTS titles.

As for the color, the strategy genre (including tactical) is green.

To the judges a :thumbup: for the quick judging.

I noticed one question as to what shump meant: that's short for shoot 'em up.