Let me start by saying I enjoy me a disaster movie, brainless or similar, now and then. Deep Impact, Into the Storm, Category 6, Category 7, Cat. 8, Aftershock: Earthquake in New York, End of the World (2013, Greg Grunberg) etc.
The movie starts, and :
Why are the good 'ol USA characters in Yemen with a weapon that can destroy the planet? You will never know. Why are they being shot at? No idea. What is the story? You will never care!!