Delta Force got bored.
The green flashes of light were the scopes on their weapons. The industrial chopping noises were Blackhawk choppers in the distance extracting them from the training exercise. They probably thought the house was unoccupied, or that they would simply go unnoticed....United States Army officials later said that this group had grown bored of training on base and had opted to carry out training in real, populated American towns. The local newspapers wrote extensively on the staged attack exercise and Houston radio broadcaster Alex Jones gathered clippings of these articles.
Look for combat boot prints outside your house.
Truth is stranger than fiction.