I don't know your age, but I can bet everything I own and I will ever own that during my lifetime (I am 30 now and plan to live for at least 40 more years) you aint gonna see anything of the short. Life aint Hollywood, despite the internet wanting it to be otherwise
On this day in 1983 if I walked up to somebody and told them that we will have handheld devices with hundereds if not thousands of times the computational power of even the largest supercomputer of the day in 30 years they would have laughed and said exactly what you had said..
I bet the situation would be the same if you said "and on top of that, in less than 15 years humanity will be able to fully clone animals that will go on to live a full and healthy life.
Science fiction becomes science fact every single day. A lot of people have had to eat their words saying that such a scenario would "never" play out.
Is it likely? No, of course not, there's no evidence supporting intelligent alien life or anything close to an impending alien invasion, and therefore an anti-alien military outfit would be pointless.
Is it possible? What isn't.
EDIT: not sure how i'm "twisting meanings and words" when the simple truth is that in-universe there are aliens and in-universe the X-COM project and threats of alien invasion are real.
I can't understand how people can blow their tops about something like this without leaping out of their seat when they meet Persia as America in any standard game screaming and spitting at the screen "THAT NEVER HAPPENED, THAT'S IMPOSSIBLE!"
of course it's impossible, it's a video game, that's what they're for.