Prince Harry has thanked staff at the Blackpool-based charity, Veterans UK for their "amazing work".
Prince Harry met members who have received help from Veterans UK, including widow Jemma Neilson, 29, of Preston, whose husband Darren, 31, was killed four months ago in a tank explosion during a training exercise at Castlemartin, west Wales.
She explained how she had received support with her pension entitlement and access to the Armed Forces compensation scheme.
Mrs Neilson and daughter Millie, eight, moved out of military accommodation following the loss of her husband, who had been her childhood sweetheart since the age of 14.
They are living with her parents but with the continuing help of Veterans UK, Mrs Neilson said she hopes to buy her own home.
Mrs Neilson said Harry was "so friendly" and had "instantly" put her at ease with his listening skills.
Prince Harry visited Veterans UK to mark the 25th anniversary of the charity's helpline service that provides welfare support for ex-servicemen and women and their families.
The 24-hour helpline receives hundreds of calls every day.