There was this sci-fi animated series. A cartoon show, if you must. It had a group of men and a woman who were part of some special elite group. The had lego blocks sort-of-a-thing on their body (not sure if as a part of their armour). Whenever the need arose, special weapons or types of equipment would attach to their backs, their arms etc. For example, you could attach jetpack wings to the back and basically fly. Or you could attach a gun to your arm.
I am just able to remember one particular scene and have mentioned all that I could recall from it.
All the characteristics of the show I would now further describe may be from a completely different series and just mixed up with this memory.
There was this white dude, who was the leader of this squad and would get the best possible equipments for a particular fighting climax.
The setting was a pretty modern day era, which I don't think had dark gloomy alien species. Completely not sure about this part though.