- OP
- Acronym:Observation Post
- OSCE
- Acronym:Operation for Security and Co-Operation in Europe
Operation for Security and Co-Operation in Europe
- OSGA
- Acronym:Office of the Secretary General in Afghanistan
- P
- Definition:Wound pensions or gratuity
- PfP
- Abbreviation:Partnership for Peace
- PO/ERA
- Abbreviation:Petty Officer Engine Room Artificer
- PSAT
- Acronym:Personal Security Awareness Training
- PSO
- Acronym:Peace Support Operations
- PSPCC
- Acronym:Peace Support Platoon Commanders Course
- RDF
- Acronym:Reserve Defence Forces
- Recce
- Abbreviation:Reconnaissance
- RO/
- Abbreviation:membership rolls of the organisations involved
- RTA
- Acronym:Road Traffic Accident
- SC&S
- Acronym:Senior Command and Staff
- SF
- Acronym:Sustained Fire
- SFOR
- Abbreviation:Stablisation Force
- SMO
- Item for:Senior Medical Officer
- SP
- Acronym:Service Pension
- Sqn
- Abbreviation:Squadron
- SRAAW
- Acronym:Short Range Anti-Armour Weapon