She was the daughter of Lt.-Col. Geoffrey Beauchamp Astley Cooper and Louisa Maude White. She married Lt.-Col. Peter Jarret Lewis, 21 Sept 1946.
| Unit or location | Role | Posted from | until |
|---|---|---|---|
| Edinburgh Golf Course Instation | Operator | 02 Sep 1942 | 29 Oct 1942 |
| Salisbury Instation | Operator | 1942 | 1942 |
| Bury St Edmunds Instation | Operator | 29 Oct 1942 | Unknown |
Visited by Beatrice Temple at the following locations; Salisbury 14 Apr 1942, Edinburgh 2 Sep 1942 where she is recorded as wearing a red belt. Hannington Hall course 26 Oct 1942.
Rosemary replaced Mary Shaw at Bury St Edmunds, Suffolk after Mary was hit by a car resulting in serious head injuries.
Beatrice Temple recorded in her diary; "Tuesday April 14 1942 Astley-Cooper and Holmes – want to be Platoon Officers. Sept 20 1942 Charles at Hannington Hall – advised me to get rid of all the ATS who want to go. Edinburgh Officer Cadet Training Unit closed – Astley-Cooper and Hay-Whiting (now Goodman), must go at once".