I worked for DN Tanks before the company merge, when it was still DYK Inc. It was an excellent work atmosphere, full of people who genuinely strove to produce infrastructure and documentation of the highest quality. The company followed through on the belief that happy employees make for quality work. Luncheons and company picnics were common, in addition to typical holidays. There was always a door open to hear a new idea.
I did not leave the company for lack of opportunity. I simply had my own path to pursue, which led me to the Marine Corps as my next employer.