They have earned many medals - The 1914 Star, The 1914-15 Star, The Victory Medal, The British War Medal, The African Star, The Italian Star and the WWII Service Medal.
The units they have served in have included The Royal Engineers, The Royal Signals, The Royal Horse Artillery and The Irish Guards.
Some have returned from war as heroes, some have been discharged due to injuries they received and there have been many that haven't returned. These are remembered on memorials across the world.
Here are some of those that have served. I will add more as time allows.