A test of the Kaminari phaser weapon at Pluto/Charon Starfleet Weapons Range kills 32 and destroys testbed starship ex-USS WHITTLE (LANCASTER class,
NCC-1227).
The Federation and Starfleet celebrate their 75th anniversaries. A new class of "supercruiser" is proposed, which will eventually become the CONSTITUTION class starship.
2237
Combined fleet exercises are conducted at Wolf 359.
2238
The New Venice colony is evacuated by BELLEAU WOOD class starships.
2239
Battle of Caleb IV.
USS AELITA (VALLEY FORGE class, NCC-1480) intervenes in mining dispute in the Ptomaine System.
VALLEY FORGE class starships USS DIANA (NCC-1470), USS BOXER (NCC-1498), and USS DOLPHIN (NCC-1504) hunt Orion pirates near the "Elbow of Böotes."
Klingon Chancellor K'tok is assassinated, leading to 2-month civil war.
2257
Klingon Empire withdraws from Treaty of Korvat.
Federation escalates campaign to limit Klingon access to mineral resources.
2261
The Filassh-B III colony is evacuated by BELLEAU WOOD class starships.
PARIS class retired.
2262
Four ASIA class starships receive major refit and upgrade.
The Klingon and Romulan Empires sign a treaty under which Klingon D7 class cruisers and M/AM reactor technology are exchanged for Romulan raw materials and cloaking technology.
2263
Klingon E-12 class destroyer enters service.
Starfleet uncovers a conspiracy to instigate a war with the Klingon Empire.
The Romulan Star Empire emerges from isolation, following a raid across the Neutral Zone by a single CRICKET class "Bird of Prey" the incursion was defeated by USS ENTERPRISE (CONSTITUTION class, NCC-1701).
USS GODDARD (GAGARIN class, NCC-526) decommissioned after a training accident that kills 7 cadets.
Starfleet holds war games at Wolf 359.
2267
The Four Days' War begins; the conflict is ended by Organian intervention four days later.
GAGARIN class retired.
USS CONSTELLATION (CONSTITUTION class, NCC-1710) destroyed in an attack by an unknown "planet killer" device.
The crew of USS EXETER (CONSTITUTION class, NCC-1706) is killed by a virus native to Omega VI.
USS INTREPID (CONSTITUTION class, NCC-1708) destroyed by an enormous single-celled, space-borne organism.
2268
Starfleet tests of the experimental M-5 multitronic computer end in disaster. USS EXCALIBUR (CONSTITUTION class, NCC-1705) and USS LEXINGTON (CONSTITUTION class, NCC-1709) severely damaged in the incident.
Starfleet obtains an example of the Romulan cloaking device in a classified cross-border intelligence raid.
USS DEFIANT (CONSTITUTION class, NCC-1717) disappears into interdimensional rift near Tholian space.
2269
AL-BURAK class retired.
2271-73
CONSTITUTION class starships receive major refit and upgrade; USS ENTERPRISE (NCC-1701) is first starship relaunched.
2274
ENTERPRISE class heavy cruiser enters service.
2276
BELLEAU WOOD class retired.
CAPELLA class retired.
2277
AVENGER class and PREDATOR class starships receive major refits and upgrades.
2284
SIEGFRIED class retired.
2285
USS ENTERPRISE (CONSTITUTION class, NCC-1701) scuttled by Admiral Kirk at the Genesis Planet.
2286
KESTREL class retired.
2287
VALLEY FORGE class retired.
ASIA class retired.
2289
Starfleet Intelligence and Starfleet Tactical each commission projects to develop advanced warships for deep penetration of enemy territory.
2293
Klingon Chancellor Gorkon is assassinated.
The Khitomer Conference ends hostilities between the Klingon Empire and the Federation.
IKS T'KEK (D7 class) is presented to the Starfleet Museum by the supreme admiral of the Klingon Imperial Fleet, in commemoration of the Khitomer Accords.
USS ENTERPRISE (ENTERPRISE class, NCC-1701-A) is decommissioned and presented to the Starfleet Museum.