What does PO stand for?

Possession of the US (IRB)

This definition appears very rarely and is found in the following Acronym Finder categories:

Military and Government

Other Resources:

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Police Officer Polikarpov (Soviet aircraft designer) Política Operativa (Italian: Operational Policy) Polonium Pool Poop Occurs :-) Por Orden (Spanish: on Behalf of and By Order Of) Port Orchard (Washington) Portsmouth (UK postal code) Portugal (Including Azores Island & Madeirais)		Post Office Post-Operative Postal Operator (PostEurop) Postal Order Pouces (French: Inches) Prato, Toscana (Italian province) Prenegotiation Objective (USACE) Presidential Office Presiding Officer Presiding Overseer

Samples in periodicals archive:

The digital designs, found in heavily encrypted computer files in Switzerland, are believed to be in the possession of the US authorities and of the International Atomic Energy Agency, in Vienna, but investigators fear they could have been extensively copied and sold to "rogue" states via the nuclear black market.

Blueprint for nuclear warhead found on smugglers' computers

In the possession of the US, [weapons of mass destruction] are good, and must be kept for the sake of world security.

We must stop them! (Baffour's Beefs)

On March 10, President Ernesto Perez Balladares formally took possession of the US Rodman Naval Base near the Pacific entrance to the Panama Canal.

PANAMA: U.S. STEPS UP TRANSFER OF MILITARY BASES