During World War I he served with the Royal Army Medical Corps in Gallipoli , Thessaloniki and Palestine .
Brooker was a member of the Territorial Force , the volunteer component of the British Army , and a precursor to the Territorial Army .
During World War I Brooker served with the Royal Army Medical Corps in Gallipoli , Thessaloniki and Palestine .
Brooker was a member of the Territorial Force , the volunteer component of the British Army , and a precursor to the Territorial Army .