Sorry about me being MIA, but the part about the armour sealing itself is actually under current developtment in the US Army under the Landwarriro system, if the History channel is to be belived. But, personally, I like the idea of the body armour being unsealed, this is off the shelf tech, not still in RnD tech. Though, I would like to see what would happen if the troopers were given a man-portable vulkan. Ok, I know, not doable, but, to me oh so sweet a dream.
*wipes off the drool from his face.* Anyways, I do like the idea of the missile launch instead of exploding on contact, of deploying a cluster bomb warhead. Hazardous, yes, feasable, yes. A simple motion sencor trigger would be immune to the alien EW, JUST, do not set the mines at the door of the alien vessel.
And speaking of mines, what about the use of Claymore mines? I remember in all the X-Coms there was a claymore type that remained viable almost to end game. The thought here though, is instead of a radio detonator, we have to due to the advanced alien EW, fall back on the old tried and true clacker. *clack, clack, BOOM!* Ball-bearings go bouncing EVERYWHERE shredding anything not in hyper advanced body armour. And even then its a crap-shoot if you survive if you are point blank.