See the web site for current details. Note that a service record may be expensive depending on how much information they have on him, and may take up to 6 months to get. You should be able to get the records if the subject has been dead for 10 years or if his date of death is unknown 90 years after he was born. If he is still alive you must have his permission to get his records.
Once you apply via the web site, they will send a letter telling you how many pages they have on him and you can decide to purchase them or not.