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What 'tactical threat'?
An armed/unarmed attacker? You need excellent cardio endurance because your heart and adreneline will race and exhaust you quickly. So you need a variety of cardio including long distance running, sprinting, hiking under a moderate load, swimming, and some form of grappling experience (judo, wrestling, etc.), and others mentioned cross fit - which is a great workout to build overall body strength.
You need to build good/great core strength and good leg strength and fair arm strength at minimum.
Also, I did IDPA recently and that re-enforces the need to train your brain and shooting/decision making under stress. This is very important.
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