That is what I figured. Our first EP for Hypoxia is Emergency Oxygen Green Ring (our supplemental oxygen) - PULL. We use to train in the old altitude chamber (think Officer and a Gentleman), but now they have this awesome new training device called the Reduced Oxygen Training Device (ROBD). We can sit in front of a computer console and "fly" the sim and they can take you right up to 40,000' if they want and with no side effects or regular dangers from the chamber.

USMCFLYR