Question to the Ministry of Defence:

To ask the Secretary of State for Defence, how many reports of sexual assault have been filed by female service personnel in the (a) Royal Navy, (b) Army and (c) Royal Air Force in each year since 2014.

An annual official statistic on cases of sexual offending handled by the Service Justice System has been published since 2015:
https://www.gov.uk/government/statistics/murder-manslaughter-sexual-offences-and-domestic-abuse-in-the-service-justice-system-2023

This shows the numbers of sexual assault cases investigated by the Service police by Service and, separately, the numbers of females and males who have been victims of such assaults. The latter category is not further broken down by Service. Data for 2024 will be published shortly. Cases reported to the civilian police are not captured in the official statistic.