Spacecraft information: OPS 4321
| Launched | 21 May 1967 |
| Flight ended | 29 May 1967 |
| Status | Decayed |
| Launch site | Air Force Western Test Range, California, USA |
| Owner | United States |
| NORAD ID | 2813 |
| COSPAR ID | 1967-050A |
| Observing |
Launched alongside
OPS 5557Spacecraft information: OPS 4321
| Launched | 21 May 1967 |
| Flight ended | 29 May 1967 |
| Status | Decayed |
| Launch site | Air Force Western Test Range, California, USA |
| Owner | United States |
| NORAD ID | 2813 |
| COSPAR ID | 1967-050A |
| Observing |
Launched alongside
OPS 5557