Rank-and-file soldiers have formally accepted a pay deal that will see their income increase by up to €675 per year.
This followed a report by the Independent Pay Commission.
The decision by PDFORRA follows a similar move by RACO, which represents soldiers of officer rank.
The Department of Defence says the decision means that soldiers, sailors and aircrew will benefit from increases in pay and restoration of allowances immediately.
Among the recommendations are a 10% increase in military service allowance, which will boost the earnings of the majority of Defence Force personnel by between €602 and €675 a year.
It will also see the full restoration to pre-Haddington Road levels of the security duty allowance and patrol duty allowance.
The deal also involves restoration of the premium rates for certain weekend duties, and the reversal of a 10% cut in overseas allowance.
Reacting to the decision, Minister with responsibility for Defence Paul Kehoe said: "I am delighted that PDFORRA, which represents thousands of soldiers, sailors and air crew, has accepted the findings of the Independent Pay Commission.
"This will result in immediate benefits for their members."
Minister Kehoe added that he now wants to get personnel numbers back to recommended levels.
"This will be a challenge for the Defence Forces and me as minister, but I am determined to work with the representative associations to make sure that we get our strength levels back up to 9,500 personnel.
"The most important point of that is that they are fully funded, and I am wanting to work - and will work - with all stakeholders to make sure that we get strength levels back up again".
While Taoiseach Leo Varadkar said: "It's very welcome news that PDFORRA has accepted this pay package, which will make a real difference to salaries for our Defence Forces.
"Increases will be paid to servicemen and women before Christmas.
"It follows the decision by officers last month to accept a similar offer.
"This will help us to attract and retain the personnel we need to serve and protect us both at home and abroad."