Hertzila, what i am talking about is nuclear weapon. Nuclear does not means "nuclear bomb". For instance, there are "nuclear plants", and afaik their goal is not to be exploding, but to provide energy.
Its obviously dumb to think about using a nuclear bomb on the field in a tactical squad game. It could be implemented in some way in the geoscape, but to be honest im not sure what purpose it could serve - aliens goal isnt to kill everyone, and there no alien target big enough for phallanx to justify using a nuke - bases being underground.
So what i was talking about is nuclear powered weapons, or as in the modern weaponry and as mfos mentionned, U-238 ammo.
And for the high tech, i didnt mean Sci-Fi high tech, i played the game you know, its hard not to noticed those theres alot of sci-fi high tech already. Other than uranium weaponry, theres javelin missiles (rising in the sky to attack the target from above), claymore mines, a large palette of unmanned drones and reconnaissance devices, extremely quick automatic turrets, and so on ...
I dont say we need to put every existing weapon in the game, but that being limited to old and very conventionnal weapons (machinegun, rifle, shotgun ...) is odd.