I haven't seen it mentioned yet, though I could have missed it, but it seems strange nobody has brought up JADE HELM in relation to the helicopters in LA the other night.

https://en.wikipedia.org/wiki/Jade_Helm_15_conspiracy_theories

http://www.thedrive.com/the-war-zone/12272/we-may-finally-know-what-jade-helm-has-stood-for-all-along

https://www.washingtonpost.com/news/checkpoint/wp/2015/09/14/remember-jade-helm-15-the-controversial-military-exercise-its-over/?noredirect=on&utm_term=.a82e95b1524b