Family, friends and senior military figures will gather for the funeral of Corporal Channing Day in Northern Ireland today.
The 25-year-old, who served with the 3 Medical Regiment, will be buried with full military honours after a service in her home town of Comber, Co Down.
A minute's silence will be held at the town's war memorial before the funeral cortege makes its way to First Comber Presbyterian Church.
Hundreds of mourners are expected to attend. Military padre Reverend Albert Jackson will lead this afternoon's funeral service.
A serving British soldier from 1 Lancs regiment has been arrested on suspicion of murder, the Ministry of Defence said.
Kandahar Governor Tooryalai Wisa said a US soldier left his base in Kandahar on Saturday and opened fire on civilians.
A US soldier has been detained in Afghanistan after shooting civilians in the southern Kandahar province, the NATO-led International Security Assistance Force said. Spokesman Captain Justin Brockhoff said: "It was a shooting incident involving multiple civilians wounded."