Danielle E. Casco, range safety officer, Range Management Development Division, is a Marine veteran and has worked for RCU for nearly 10 years. Casco has a love of animals, nature and her adopted elephant, Billie. (Official Marine Corps photo by Cpl. Medina Ayala-Lo/Released) - Danielle E. Casco, range safety officer, Range Management Development Division, is a Marine veteran and has worked for RCU for nearly 10 years. Casco has a love of animals, nature and her adopted elephant, Billie. (Official Marine Corps photo by Cpl. Medina Ayala-Lo/Released)