English
| U-638 | Type VIIC |
| Feldpost Number | M 51 249 |
| Construction Yard | Blohm und Voß, Hamburg |
| Yard Number | 614 |
| Ordered | 20th Jan 1941 |
| Keel laid | 16th Oct 1941 |
| Launched | 8th Jul 1942 |
| Commissioned | 3rd Sep 1942 |
| Baubelehrung | 8.KLA, Hamburg |
| Training, Flotillas and Duties | |
| 09.42 – 01.43 | 5.U-Flottille, Kiel Ausbildungsboot (under training) |
| 03.43 – 05.43 | 9.U-Flottille, Brest Frontboot (operational) |
| Commanders | |
| 09.42 – 12.42 | OL Oskar Staudinger |
| 12.42 – 03.43 | KL Hinrich Oskar Bernbeck see also: U-4 U-461 UD-4 |
| 03.43 – 05.43 | OL Oskar Staudinger |
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