The Armed Services YMCA is hosting their first ever Big Truck Day. This family friendly event will allow folks to get up close and personal to some of the area’s biggest trucks and specialty vehicles. Climb in a big rig, honk the horn, turn on a police siren or learn how a dump truck works! Spend the day with some of the biggest trucks and hardest working people in Lawton Fort Sill. Free & open to the public. Food trucks will be on site.