"Both missions AS-204 and AS-205 are essentially long duration system validation flights. AS-207/208 is the first of a series of very complicated missions. A valid operational requirement exists to include an optical equal-period rendezvous on AS-205. The rendezvous would be similar to the one initially planned for the Gemini VII flight using, in this case, the S-IVB as the target vehicle." The maneuver would give the crew an opportunity to examine the control dynamics, visibility, and piloting techniques required to perform the basic AS-207/208 mission.