The Marine operation was/is not part of Jade Helm,
This operation is part of the WTI course which is considered an advanced level course in the employment of Marine aviation. Its been going on in Yuma, Arizona twice a year since 1977.
The event shown in the video are of one of about a dozen major flight evolutions planned and flown by students and have been using that location (one of the city parks)since 2005 or 2006 with the city governments authorization. They announce this in the media beforehand and invite the public to come out and watch.
These are the same kind actions that could be required in an Embassy evacuation.
Securing a Landing Zone has been a mission and training requirement since the first use of helicopters by the military.
Search MAWTS-1 and WTI on the Marine Corps unit and the training it conducts if interested.