AA - American Forces Americas
AE - American Forces Europe
AP - American Forces Pacific 

APO - Army/Air Post Office
APO (Army Post Office)*
BCP
CMR (Community Mail Room)
DPO - Diplomatic Post Office
FPO - Fleet Post Office
PN
HTTP
HTTPS
PCI
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OMDC (Official Mail Distribution Center)
PSC (Postal Service Center)
RPO (Regional Post Office)
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SKU
SMS
SSL
TSL
UMR (Unit Mail Room) or just Unit