English
| U-138 | Type IID |
| Feldpost Number | M 02 840 |
| Construction Yard | Deutsche Werke AG, Kiel-Gaarden |
| Yard Number | 267 |
| Ordered | 25th Sep 1939 |
| Keel laid | 16th Nov 1939 |
| Launched | 18th May 1940 |
| Commissioned | 27th Jun 1940 |
| Baubelehrung | Baubelehrung U-Boote Ostsee, Kiel |
| Training, Flotillas and Duties | |
| 06.40 – 12.40 | 1.U-Flottille, Kiel Ausbildungsboot (under training) Frontboot (operational) |
| 01.41 – 04.41 | 22.U-Flottille, Gotenhafen Schulboot (training boat) |
| 04.41 – 06.41 | 3.U-Flottille, La Pallice Frontboot (operational) |
| Commanders | |
| 06.40 – 10.40 | OL Wolfgang Lüth see also: U-9 U-43 U-181 |
| 10.40 – 12.40 | KL Peter Lohmeyer see also: U-19 U-651 |
| 01.41 – 06.41 | OL Franz Gramitzky |
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