These passes were issued to NASA personnel and granted access to various areas of NASA facilities. In this case the pass allowed the bearer access to the firing room. TheFiring rooms are the heart of the Launch Control Center at Kennedy. All the activities involved with preparing rockets, spacecraft, and payloads for space can be controlled by engineers sitting at computer terminals in the firing rooms. Likewise, all activities at the launch pads can be run from a firing room
This pass belonged to Gene Sestile who was a Test Conductor and was responsible for "managing" aspects of the launch. A fuller description of Gene and his duties is included in a write up found in the SpacePort News dated August 5th 1966, The AS-202 flight launched on August 25th 1966.
Here is a write up about Gene, seen during a previous launch to AS-202