An RAF reservist is claiming unfair dismissal after being told he was to be made redundant from his £75,000-a-year job at a city bank while serving in Kosovo.
The case is being watched by the Ministry of Defence because of implications for reserve forces such as the Territorial Army.
An employment tribunal has been fixed for three days in June.
Sebastian Nokes, 34, worked for Credit Suisse First Boston in London as vice-president in the strategy sector of the bank.
Nokes is also pursuing a claim for racial discrimination on the grounds that the bank's Swiss employees do not experience career damage when they are called up for national service.
He served as a flight lieutenant from 19 April until 18 August last year. While on active service, Nokes was called back to London and advised to resign or be made redundant.
In September, he received a letter terminating his employment from the following day.