psyop-military actions designed to influence the perceptions and attitudes of individuals, groups, and foreign governments.
Choose certified mail when you need proof of delivery and time is of the essence. Registered mail is the Postal Service's most secure form of mail delivery, involving an unbroken chain of custody. Registered mail is protected in sealed containers, safes and cages, and held under lock and key.
You can send your mail as regular mail, certified mail, or registered mail. Regular mail is the cheapest as you have to pay more for certified mail and registered mail. Here are other differences between certified and registered mail.