Wilfred Laws was in the Royal Army Medical Corps in WWI. The RAMC is part of Army Medical Services along with the Royal Army Veterinary Corps, Royal Dental Corps and the Queen Alexandra’s Royal Army Nursing Corps.
Although medical services have been provided in the British Army since C17th, it was not until 1898 that officers and soldiers providing medical services were incorporated into a new body known as the Royal Army Medical Corps. It began to develop in the Boer War but it was really in WWI that it came into its own both in size and experience.
In WWI RAMC operated the medical units and provided medical detachments for the units of infantry, artillary etc. RAMC officers and men did not carry weapons or ammunition. During WWI 743 officers and 6130 men were killed.