The HM Forces Railcard costs £21 and it'll save you 1/3 on most rail fares throughout Great Britain for a whole year. That works out to under £2 a month for huge savings.
You're eligible if you're a member of the Regular Forces or Volunteer Reserves or a spouse/civil partner of a member, for more details see eligibility.
There are plenty of ways you can use your Railcard, for both long and short trips. Better still you can use it anytime on weekends, Public Holidays and during the week. The only restriction is that if you travel before 10am Monday to Friday (except during July and August) a minimum fare will apply.
Your HM Forces Railcard will save you 1/3 on many tickets. As with most things in life, there are some exceptions, so take a look at the ticket types you can and can't make savings on with your HM Forces Railcard
Please note that the railcard can only be used for non-duty (leisure) travel only. Commuting between home and place of duty, work or education is not available.