A court martial hears that two senior officers did not deal properly with allegations made by the soldier.
King Charles addressed the Gurkha unit at a formation parade held at Larkhill Barracks.
Royal Artillery Bombardier Nadine Askew took her own life in 2021 after a fight with a colleague.
Royal Artillery Bombardier Nadine Askew had served tours of duty in Iraq and Afghanistan.
The new museum will be home to more than 600 field guns, howitzers, mortars, rockets and medals.
The two high-ranking officers failed to act when Gunner Jaysley Beck, 19, reported a sexual assault.
Aaron Nomicas, 20, attacked the victim as she lay on the street in a city centre.
The support will be carried out by solicitors outside of the Ministry of Defence.
Two charities say more needs to be done to help victims of sexual assault.
