Anna Irwin (pictured) died from lung cancer at the age of 38 in October 2017 after serving eight three-month tours in Afghanistan and being exposed to more than 2,000 hours of toxic helicopter fumes.
Troops who travelled in Sea King, Wessex and Puma and Chinook helicopters have developed cancers including lung cancer, testicular cancer and throat cancer.
Anna-Louise Bates lost half of her family when a careless driver hit them as they walked home six years ago. Her son Fraser died at Royal Glamorgan Hospital in Cardiff.