(07/03/1975) -- ASTP crewman Thomas Stafford is suited up for the Countdown Demonstration Test. The test, a step-by-step dress rehearsal for the July 15 luanch, will culminate in a simulated T-zero and launch. Yesterday the 'wet' portion of the test was conducted with the vehicle fueled as it will be on launch day. The fuels were offloaded and the terminal portion of the count repeated with the prime crew aboard the spacecraft.