Under the Defence Forces Pensions Schemes, pensionable service consists mainly of full-time service in the Permanent Defence Force – PDF. Service in An Fórsa Cosanta Áitiúil – FCA – is not generally reckonable as pensionable service. Exceptionally, however, service on full-time security duties by members of the FCA may be reckoned and may be aggregated with pensionable service in the PDF. These exceptional provisions apply only to former members of the FCA who were assimilated into the PDF under special arrangements made in 1982 and 1988-89 or who enlisted in the PDF outside of those special arrangements and were in service on 1 January, 1990.