Navy Petty Officer 2nd Class David Madmon conducts a surface supplied dive using the Kirby Morgan 37 dive helmet during diver training aboard the USAV Matamoros on Naval Air Station Key West, Fla. Jan. 16, 2015. Madmon is a builder assigned to the Underwater Construction Team Two. Navy Petty Officer 2nd Class David Madmon conducts a surface supplied dive using the Kirby Morgan 37 dive helmet during diver training aboard the USAV Matamoros on Naval Air Station Key West, Fla. Jan. 16, 2015. Madmon is a builder assigned to the Underwater Construction Team Two. SHARE: Download: Full Size (2.75 MB) Tags: photo essays Credit: VIRIN: 437553-Q-WFK39-505.jpg Photo Gallery