The cruiser U.S.S. Achernar, the first of its class, became operational in September 2252.[Notes 1] A very successful design, 68 Achernar class vessels were built, and the class saw extensive combat during the Four Years War. Following the war, nearly all were destroyed in weapons testing as part of Starfleet's post-war demilitarization program.
- "The Four Years War" referred to events by a FASA-specific dating standard called the "Reference Stardate." All dates in this article have been adapted from that notation into standard calendar dates, which are then adjusted for errors in the baseline dates used as reference by the FASA authors. Working with a known, dated event (e.g., the launch of the Constitution class starships), the other dates in the timeline can be adjusted accordingly. "The Four Years War" gives the launch of the Constitution class as Reference Stardate 1/8801.04, or 04 January 2188; this has been established on screen, however, as having occurred in 2245. As the exact month and date remain unstated in other sources, those remain the same, but the year is adjusted to 2245, giving a modified date of 04 January 2245. This can then be converted into the pre-TOS stardate system established in Star Trek (2009), giving us a stardate of 2245.004. Using this as a baseline, all other dates in the FASA timeline can be similarly modified and converted. The Achernar class was noted as becoming operational on Reference Stardate 1/9509; converting as stated previously gives a modified date of 2252.09.