Naked Soldiers

It amazes me how naked combat soldiers look without warring body armor.. They are running around and not ducking. I kind of hope this is some kind of exercise, but it looks like live fire. I'm confused. I glanced at the comments and others seem to raise the same concern. I wonder if the position started taking fire when the unit was standing down for whatever reason and they all boiled out on the roof without donning combat gear.

Someone had time to grab the camera. I tried to listen the second time round and someone says something about gearing up. I can't make it out. God bless them.