/sci/ - Science & Math

>>7912052
just how delusional are you?

I'm a writer. My current book is militaristic in nature, and while fiction, I kind of want it to maintain an aura of realism. It takes place in the not distant future, so the people in it have access to futuristic weaponry. I'd like to know if any of these are at all currently (or soon to be) possible.

>HALO jumps from the upper atmosphere
>Cloaking devices for individual personnel (not bending light as is seen in science fiction, but using billions of microscopic cameras)
>A system that allows a person to remain sustained through long periods of time without eating/drinking (in my book it is intravenous, but I could alter it if realism permits); something that provides nutrients and abates the need for tangible sustenance
>Pills/intravenous medicine that prolongs autonomy (ie. going without sleep for days at a time without an exhaustive/"groggy" feeling)
>goggles/eyewear that produces a wavelength of radiation that allows a person to see through close walls
>grenades that produce a large enough electric current to the blast radius such as to incapacitate others
>body armor that is malleable enough to move in, but hardens when impacted (ie. from a bullet), so as to prevent damage to the wearer

Are any of these within the realm of feasibility considering the current state of scientific and militaristic development?