KH-8 18 (GAMBIT 56) was launched on 1968 Dec 4 by Titan IIIB Agena D from Vandenberg. This mission, which lasted 8 days, was the first of three that would use a much higher apogee. The reason for the high apogee missions is not known.
| KH-8 18 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1968 Dec 4 | Launch by Titan 3B Agena D | V SLC4W | |
| 93.30 136 x 736 x 106.2 | |||
| 1968 Dec 4 | 2332 | 93.26 126 x 741 x 106.3 | |
| 1968 Dec 5 | 0851 | 93.27 132 x 736 x 106.2 | |
| 1968 Dec 6 | 0459 | 92.37 127 x 654 x 106.2 | |
| 1968 Dec 9 | 0341 | 91.98 124 x 619 x 106.2 | |
| 1968 Dec 11 | 0311 | 91.90 133 x 602 x 106.2 | |
| 1968 Dec 12 | 0209 | 91.83 135 x 593 x 106.2 | |
| 1968 Dec 12 | Reentered after 8d | ||