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OTV 4
Launch Details
| Launched | 19 May 2015 |
| Flight ended | 6 May 2017 |
| Status | Decayed |
| Launch site | Air Force Eastern Test Range, Florida, USA |
| Owner | United States |
| NORAD ID | 40651 |
| COSPAR ID | 2015-025A |
| Alternative names |
USA 261 |
| Observing |