The US Army Research Laboratory (ARL) is responsible for plenty of innovative 3D printing research over the years, such as 3D printing drones and working with recycled 3D printing material … Dr. Hornbuckle himself developed the probe during his time as a graduate student at the University of Alabama. Army scientists and other researchers now ask him for his help in characterizing samples, and use APT technology to determine which atoms are located where in a material. Sources: 3-D Print, APG News, 3D Printing Industry, Inside 3D Printing