On Wednesday night in Long Beach, CA, the U.S. Army conducted intense training exercises involving low-flying MH-6 helicopters and loud explosions. This event was part of the training drills for the Army Night Stalkers.
  

Key Points: 

1. The U.S. Army carried out training exercises in Long Beach, CA, which included the use of MH-6 helicopters.
2. These drills were characterized by loud explosions and helicopters flying low throughout the night.
3. The training was a part of the exercises for the Army’s elite unit, the Night Stalkers.
4. The event highlighted the specialized equipment and tactics used by the Army in urban and specialized operations.

Source: https://www.military.com/video/night-stalker-mh-6-drops-soldiers-long-beach