Formal reprimand

A formal reprimand was a disciplinary action taken by Starfleet to officers or Cadets who undertook unauthorized actions.

In 2152, after losing his communicator on a pre-warp planet, Lieutenant Malcolm Reed told his commanding officer Jonathan Archer that he was prepared for any reprimand he would give him due to his carelessness. 

Later that year, Travis Mayweather worried that he might be the recipient of a reprimand on his record after he became late for his duty shift on when Dr. Phlox kept him in sickbay for quite a long time obsessing over his headache. 

In 2154, Commander Charles Tucker teased Malcolm Reed by suggesting that he would file a reprimand for disobeying a direct order. 

In 2367, Worf was given a reprimand by Captain Jean-Luc Picard for his killing of Duras which, while legal under Klingon law, was improper conduct for a Starfleet officer. 

In 2368, Rear Admiral Brand put a formal reprimand in each of Cadets Wesley Crusher, Jean Hajar, Sito Jaxa and Nicholas Locarno's permanent records after they covered up evidence that they participated in an illegal maneuver called the "Kolvoord Starburst", which cost the life of Cadet Joshua Albert. 

In 2374, then Lieutenant Commander Worf received another formal reprimand from Starfleet Command, after he failed to meet with Dominion informant Lasaran and instead took his injured wife, Lieutenant Commander Jadzia Dax back to Deep Space 9 for treatment. Captain Benjamin Sisko told him that, as Lasaran had information that could have saved millions of lives, Worf would probably never receive the rank of Captain. 

In 2375, Captain Kathryn Janeway put a formal reprimand in Ensign Harry Kim's record, after he had a sexual relationship with Derran Tal.