All 3 childrens’ births were registered in Naas (Clara Oct - Dec 1886, Vol 2, page 757); Henry Apr – Jun 1888 Vol 2, page 809 & Ida Mary in Apr – Jun 1890 Vol 2, page 790). If you obtain one or all of those certificates it will give you Emma’s maiden name.
Military records are kept at the National Archives in Kew, London. You can search for medal records on-line (on the TNA site) but further research involves someone going to Kew and looking the detailed service records up. Bear in mind too that the military had a lot of civilian staff eg carpenters and farriers and so though the Curragh address strongly indicates he was connected to the army, it's possible he was not a soldier. His occupation should be on the birth certs though.
Sallins is about a mile north of the town of Naas, and is about 10 miles east of the Curragh Camp.