before u pay out on a sub to the world find my past site ...have u considered just checking first in their index whether they have the names etc you are after....
you may also wish to consider that there are other subscription sites... ukgenealogist british newspaper archive... war forums ,,,
and if you are in Australia you can use ancestry at your public library for free.
If there are known files of your kin in Irish forces , would it not seem more rational to buy any individual files and articles that u have been putting off for years.....
but in the end its all up to you and to what end you want to find your kin other than diggin up their bones and trying to get the answers from them....
good luck in your quest to enrich the world with subscription payments

fastfusion