Random triples
| Subject | Object |
|---|---|
| gptkb:X-33_vehicle | ground and flight tests |
| gptkb:JEP_447 | Rigorous testing conducted. |
| gptkb:JEP_350 | Extensive testing performed. |
| gptkb:JEP_342 | Comprehensive. |
| gptkb:Project_Snowbird | extensive flight tests |
| gptkb:Dyna-Soar_program | simulated missions |