Service Personnel have the choice of using the MOD Will Form which is held centrally by the MOD or to get one completed externally
For family members there are many Solicitors you can use to support writing your legal Will or alternatively there are many companies/charities that can provide support too.
Having a Will makes things easier when a person passes away as it will state how your estate/possessions should be dealt with and who it goes to.
If you are unsure what you need:
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Armed Forces Charities that offer Will Services: