Panama
on 10 February 1990, the government of then President ENDARA
abolished Panama's military and reformed the security apparatus by
creating the Panamanian Public Forces; in October 1994, Panama's
Legislative Assembly approved a constitutional amendment prohibiting
the creation of a standing military force but allowing the temporary
establishment of special police units to counter acts of "external
aggression"

Paracel Islands
occupied by China

Pitcairn Islands
defense is the responsibility of the UK

Puerto Rico
defense is the responsibility of the US

Saint Barthelemy
defense is the responsibility of France

Saint Helena, Ascension, and Tristan da Cunha defense is the responsibility of the UK

Saint Martin
defense is the responsibility of France

Saint Pierre and Miquelon
defense is the responsibility of France

Samoa
Samoa has no formal defense structure or regular armed forces;
informal defense ties exist with NZ, which is required to consider
any Samoan request for assistance under the 1962 Treaty of Friendship

San Marino
defense is the responsibility of Italy