P of W ~ Prisoner of War

P&BT ~ Physical & Bayonet Training

para ~ Paragraph

PAC ~ Parliamentary Accounts Committee

PAVG ~ Prince Alfred's Volunteer Guards (South Africa)

PB ~ Permanent Base (medical)

PBI ~ Poor Bloody Infantry (colloquial)

PC ~ Principle Chaplain

PCC ~ Port Construction Company

PD ~ Provision & Demand Office

pdr ~ Pounder (artillery e.g. 18-pdr gun)

PE ~ Peace Establishment

PEF ~ Portuguese Expeditionary Force

PFS ~ Permanent Force Staff (South Africa)

PG ~ Pushpati Guards (India)

PGR ~ Protective Garrison Regiment (South Africa)

PH ~ Phenate Hexamine (PH Helmet - gas mask)

P-in-C ~ Paymaster-in-Chief

PIC ~ Paymaster-in-Chief

PIOM ~ Principle Inspector of Ordnance Machinery

PJBIS ~ Punjabis

PJBS ~ Punjabis

PLA ~ Port of London Authority

PM ~ Provost Marshall

PMG ~ Portmaster-General

Pmr ~ Paymaster

PNRS ~ Pioneers (India)

PNTO ~ Principle Naval Transport Officer

POW ~ Prisoner of War

POWLH ~ Prince of Wales' Light Horse (South Africa)

PP ~ Pontoon Park

PPCLI ~ Princess Patricia's Canadian Light Infantry

PRC ~ Parliamentary Recruiting Committee

PS ~ Pioneer School

PS ~ Postal Section

PSA ~ Provision Supply Account

PSC ~ Passed Staff College

PSO ~ Principle Staff Officer

Pt ~ Platoon

PU ~ Permanently Unfit

PUO ~ Pyrexia of Unknown Origin (medical - trench fever)

PUO ~ Name of concert party at St John's Hospital, Etaples

PVS ~ Priced Vocubulary of Stores

PW ~ Permanent Way

PW ~ Royal Pay Warrant

PY ~ Patrol Yacht