Marines conduct special evacuation exercises twice a year as part of the Weapons and Tactics Instructor (WTI) course, currently in session through November at Marine Corps Air Station Yuma. Photographer Matt Ottosen with Artistic Horizon also shared his shots of aircraft from near MCAS Yuma and the Helo Assault that took place at Kiwanis Park Friday. Have a shot you'd like to share? Send it to newsroom@yumasun.com and we'll add it to this slideshow! Click here to read more about this training exercise.