updated Cobras and Hueys

the new updated American marine Cobra and Huey helicopters are better than the baseline aircraft in most ways. i read the recent flight report in Flight magazine on the new Cobra and it was interesting but failed to cover the agility of the new Cobra really in depth. apparantly the New Cobra has been flight tested to plus 3.5 g and to minus 0.5 g and the speed of over 200 knots. the new Huey is similary tested. wha ti want to know is this:
what manoeuvres was carried out to reach plus 3.5 g, was it loops, rolls etc?
did the Huey do the same manoeuvres as the Cobra, if tested to plus 3.5 g, was it looped, rolled etc?
was the Huey manoeuvered with a full load of troops on board up to maximum g to get flight data of the helo at that weight and load?
how does the airframe of both choppers stand up to the stress of the higher speeds and g loads? especially the Huey who has much more speed and agility than the old one.
any info would be greatly welcome! 🙂