DOTM unanswered and answered questions (lots of spoilers)

[Ode to a Grasshopper]

Skyhammer is an attack helicopter. The planes they used to para-glide into the city were used for the 'Incinerator' toy.
I don't recall the attack helicopter, unless it was inside the NEST base that Sentinel destroyed.

I seem to recall seeing a helicopter that looked like Skyhammer in the NEST base.