Hello wingood, I have not come across the name of Masterson, but will keep an eye out in my research files.
You will have to contact the Department of Defence, Pension Administration Section, Renmore, Galway to see if either of them made a pension application.
You will have to provide date of birth and the addresses they lived at in the 1920,s 30,s, 40, 50,s.
If they did, they would have had to provide references of what they were involved in and which Battalion they belonged to.
If you do write, please be patient as they are inundated with requests and it takes months for a reply, but it could be worthwhile in your research, please also remember, many people who participated in this period did not apply for a pension because they were proud.
I wish you well in your research and let us know if you have any progress
CSM