In 2267, Boma was aboard the shuttlecraft Galileo assisting in collecting data on the Murasaki Effect. Boma openly disputed Lieutenant Commander Spock's orders following the shuttle's later crash on planet Taurus II. (TOS: "The Galileo Seven")
In two non-canon Star Trek novels written by Diane Carey, Dreadnought! and Battlestations!, Boma reappeared as a civilian scientist. After the events of "The Galileo Seven", Boma was dismissed from Starfleet, consequent to a court martial hearing called by Montgomery Scott on charges that Boma was openly disrespectful and insubordinate towards Spock. He then entered into a notable scientific career, which included the development of an extremely resilient alloy used in the construction of the Dreadnought-class. Ultimately, however, he got involved in unethical weapons research.
In an apparent contradiction, Boma reappears as an officer in the non-canon novel That Which Divides, by Dayton Ward, as a science officer aboard the USS Huang Zhong. The novel takes place in the year 2269.