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Sergeant / Castor with upper stages
 Blue-Scout-Junior (HETS D-1)
|
 Blue-Scout-jr SLV1B (SRP) |
 Blue-Scout-jr SLV1C [Scott Murdock] |
 RAM-B [NASA] |
 X-17A with Project Argus W-25 Nuclear Bomb |
 Polaris-FTV-5 |
 Sergeant Hydac |
 Storm-1 |
| Version | Stage 1 | Stage 2 | Stage 3 | Stage 4 | Stage 5 |
|---|---|---|---|---|---|
| Blue-Scout-jr SLV-1B | Castor-1 (XM-33E8) | Antares-1A (X-254-A1) | Alcor (AJ10-41) | Cetus (NOTS-100A) | - |
| Blue-Scout-jr SLV-1B mod. | Castor-1 (XM-33E8) | Antares-1A (X-254-A1) | Alcor (AJ10-41) | - | - |
| Blue-Scout-jr SLV-1C (MER-6A) | Castor-1 (XM-33E8) | Antares-1A (X-254-A1) | Altair (X-248) | - | - |
| Castor Recruit | Castor-1 | Recruit | - | - | - |
| Polaris-FTV-5 | Sergeant (TX-20) | 10KS2500 | - | - | - |
| RAM-B | Castor-1 | Antares-1A (X-254-A1) | Alcor | - | - |
| Sergeant Hydac | Sergeant | Hydac | - | - | - |
| Sergeant Lance Lance Recruit T-55 | Sergeant (TX-20) | Lance (TX-77) | Lance (TX-77) | Recruit | T-55 |
| Storm-1 | Sergeant (XM100) | M-57A1 | - | - | - |
| X-17A (Pegasus) | Sergeant (TX-20) | 3 × Recruit (XM-19) | Recruit (XM-19E1) | - | - |
