I just received my camera the other day, and i do have to say I am quite excited about the opportunities around NDSTC and Panama City. NDSTC (Naval Dive and Salvage Training Center) is difficult, but not like most would think. Sure the Physical Training is uniquely challenging, but over the past months, the school has become more academically challenging than physical. However, they have their own set of words to describe Dive School's transition into an "A" School, and its not so polite. I will say, i failed my first two tests, physics and medicine; since then, I've passed my Surface Supplied, Underwater Tools, and my Demolitions (yet i failed the medicine reinforcement on the Demo). I've had Fam dives and the like, and have totaled a bottom time of :43::27 out of four dives. Three of four dives I utilized the MK-21 (Superlite 17B), and the other i Fam dived the Mk-20. i like the yellow hard hat Mk-21, however cumbersome it may be. Its a fairly big hat, but it only weighs 28 lbs, breathes easily, is fairly comfortable, and i prefer the way the 21 exhausts the bubbles out to the side away from the view port (unlike the Mk-20 and scuba).