The Office of Naval Intelligence, or ONI, was a department of the Royal Manticoran Navy charged with retrieving and using information on other star nations, including vessels, personnel, and technology.
ONI estimated thirty to forty seconds for a firing cycle of a three-round ready magazine for PRH's ground-based weapons. The PRHN's electronic counter-measures proved to be better than ONI estimated. (HH2)
In 1913 PD, ONI's Covert Insertion Team extracted Havenite Admiral Mládek from the planet Prague, using his insights to confirm information provided by the recently "resurrected" Honor Harrington. (HHA4.4: LGTP)