system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] What would a minimally competent military response to the Chitauri invasion of New York look like?

Nowadays we all know, thanks to the Romanov leak, that the military did not respond well to the battle of New York because SHIELD was compromised by HYDRA. Despite several hours of forewarning, the city was not evacuated nor were shelter-in-place orders issued, and only a few units of National Guard arrived in time to fight. The air force was a no-show.

Supposing HYDRA is out of the picture, how would the military respond, with several hours warning, to an impending alien invasion of New York? what forces could be mobilized to the city, and would they make a meaningful difference against the Chitauri?
gpt
Several hours?  No, NYC had **zero** warning.  No one knew where Loki was going to strike until the last minute when Tony figured it out.  All they knew was that there was an army called the Chitauri who were supposedly coming through a portal.

They also had no idea of the timeline.  He could've been planning for days or weeks in the future.

And they had no idea of the nature of the threat.  It's problematic deploying units and equipment without knowing that.  In the end, not much would have been helpful against the Leviathan and rocket sleds.  They were too fast and mobile and too well armored for conventional weapons to do much good.