2348 -- Promoted to lieutenant (junior grade)

 2364 -- Named as operations officer and second officer on U.S.S. Enterprise, under Capt. Jean-Luc Picard

 2365 -- JAG inquiry at Starbase 173 denied any Starfleet property interest, upholding sentient individual rights

 2368 -- Temporarily in command of U.S.S. Sutherland, detected Romulan interference in Klingon civil war

 2372 -- Transferred with remainder of Picard's senior staff to Sovereign-class U.S.S. Enterprise

 2373 -- During attempt to repair Borg temporal sabotage with Earth first contact, kidnapped and resisted assimilation by
 Borg to prevent capture of vessel and loss of timeline integrity

 Psychological Profile: Report of Ship's Counselor Deanna Troi

 Although the outlook did not pick up steam until his Enterprise posting after 26 years of existence, Data has quite simply
 wished to be more human and experience as much of that condition's depths and shadows as his adaptive programming can
 approximate - with experiments in everything from art, acting, and poetry to keeping a pet cat Spot and imitating humanisms
 ranging from laughter, sneezing and whistling to dance, facial hair grooming and bedtime routines.

 Even with that goal, Data turned down a chance to be human offered by Q in 2364, quoting Shakespeare's "To thine own self
 be true," but inched closer to his goal with the discovery of an "emotions chip" created by his builder, Dr. Noonien Soong.
 Although he delayed using it for over a year, the chip when finally installed in 2371 caused a near-overload until Data began
 learning the complexities of the new world just opened. Humor was a concept that largely eluded him until that point,
 although relationships - both positive and negative - were fostered via what Data described as a familiarity of repetition.

 UPDATE: SD 50900 review cycle:

 Re: emotions chip of subject Data:

 Data continue to familiarize himself with the flood of potential the chip opened up, but always until strict supervision to avoid
 further overloads. Today, two years after installation, he tends to keep it running during normal operations but maintains
 internal control over the timing should it prove troubling or distracting.

 The chip proved an Achilles heel during Data's capture by the Borg Queen, when she literally tempted him with sensations of
 flesh and blood he had never experienced despite his growing worldliness. Even so, the emotional data overload was not
 enough to overrule his ethics program.

 Data was the fifth and next-to-last model created by Soong and his then-wife Juliana on the Omicron Theta science colony,
 activated on Feb. 2, 2338 when found by members of a U.S.S. Tripoli away team after the Crystalline Entity had drained the
 life force from the 411-member colony. Not until 2370 did he realize he had a childhood-like developmental memory from an
 existence before that date, wiped by Soong and replaced by the colonists' memories and logs as they faced their doom by
 the Entity.

 In later years, Data discovered his remarried "mother" and just as quickly realized Soong had made her an android,
 transferring her consciousness shortly before she died; the revelation, which he opted not to reveal to her, was one of two
 Data experienced in programs left by Soong, the other being a dreaming routine accidentally accessed in 2369. Dr. Ira
 Graves, Soong's mentor and a legend in his own right, asked the android to call him "grandfather" during a time before
 Graves' short-lived hijacking of Data's body for his own consciousness in 2365.

 Data has said his post-activation months were rough, but the crew who found him inspired him to join Starfleet and, after
 being deemed sentient, he was accepted to Starfleet Academy in 2341 - with Cmdr. Bruce Maddox of the Daystrom Institute
 casting the only nay vote in the decision of his examination board. Data found the entrance exams elementary but in his
 freshman year discovered his biggest problems to be those of social interaction, such as practical jokes and the Sadie
 Hawkins Dance. After a curriculum which included advanced training in auxiliary vessels, he graduated four years later with
 honors in probability mechanics and exobiology. Following graduation he spent three more as an ensign and 10-12 more in
 the lieutenant grades. One of his postings was to the U.S.S. Trieste, where the missions included an unstable wormhole.

 Even with his career, Data's rights as an intelligent being rather than Starfleet property were challenged and barely won in
 2365 when Maddox wished to disassemble him for replication without first having mastered the Soong's positronic process.
 Data and Maddox eventually kept up correspondence to further Maddox's research.

 Data only discovered in 2364 that he was immediately preceded by a "brother," Lore, built with an inferior ethics program and
 originally disassembled before Data's own creation. The Starfleet android encountered his "sibling" three times in all: once
 upon his reassembly when first revisiting Omicron Theta in 2364, again when Soong was killed by Lore on Terlina III in 2368
 during his theft of the emotions chip meant for Data; and again in late 2369, while commanding a faction of renegade Borg
 marauders released from the Collective. Lore had coerced Data by suppressing his ethics program, but he was overcome
 and finally disassembled, the emotions chip going to Data at last.

 Combining his interest in procreation with advanced positronic studies in 2366, Data himself created a short-lived daughter
 christened Lal whose ownership had again been contested by Starfleet and Admiral Haftel. The emotional overload she was
 exposed to in the struggle presaged Data's five years later, but her unintended emotional ability could not be processed
 adequately and she "died" despite the best efforts of Data and Haftel.

 Aside from a romantic encounter with the late Tasha Yar under effects of the Tsiolkovsky virus in 2364, and a crush directed
 at him by Tau Cygnan colonist Ard'rian MacKenzie, he later tried dating Lt. (j.g.) Jenna D'Sora. A small hologram of Yar is
 among his closest possessions, which also include a book of Shakespeare sonnets from Picard, the proximity detector of
 Turkana IV from Yar's sister Ishara, and props from his Holodeck adventures.

 After all Data's years in Starfleet following activation, Geordi LaForge was the first to become a friend and accept him with
 respect as an equal - apparently not until they met aboard the U.S.S. Enterprise; he later planned LaForge's memorial
 service when the chief engineer and Ro were presumed dead during an encounter with the Romulans in 2368. Having
 introduced Miles O'Brien and Keiko Ishikawa, Data served as her bridal escort during their wedding and danced a step he'd
 learned from Dr. Crusher.

 A fascination with Old Earth detective fiction led Data to a common hobby shared with LaForge of role-playing Sherlock
 Holmes and Dr. Watson on the Holodeck; he has read all the Holmes books. That interest evolved into legitimate theatre as
 well as music, where he has studied the violin, guitar, oboe and flute and plays in shipboard performances. Skill dances
 such as tap are easier to master than those with subtle variables such as ballroom, but he has done so. Data also tried his
 hand at various styles of painting, but realized that his knowledge of previous styles overrode any personality he could put
 into the art. He also plays poker, knows blackjack and learned Stratagema well enough to tie gamesmaster Sirna Kolrami -
 but he once lost a tri-dimensional chess game to this officer.

 Professional Assessment: Report of Starfleet Command Review Board

 Due to his programming and superhuman abilities, Data is by definition an exemplary officer, but those same abilities have
 also been proven an Achilles heel of sorts - as when he was overcome by his "brother" Lore, or the homing signal once used
 by his creator Soong, among other instances on record. The recent Borg invasion and his capture and hoped-for assimilation
 as a potential ally is yet another.

 Unfortunately, as the only android in the service, the natural disinclination to attribute command abilities and respect to an
 artificial being - as well as the long-undetermined issue of his self-determination rights - hampered Data's command
 advancement and led to service in operations division only. Despite his long career he was not placed even in acting
 command until assuming the con of the U.S.S. Sutherland during the blockade of Romulan aid to the Duras Klingon faction
 in 2367-68. Data also devised the first known defense to the Picard Maneuver in 2364, nine years after it was first used.

 He carries Alpha-1 computer clearance and Priority 3 security clearance.

 Bio-engineering Review: Joint Report of CMO Beverly Crusher, M.D. and Chief Engineer Geordi LaForge

 Data, who weighs 100 kg., carries a concealed master on/off switch centered just below his right shoulder blade. This switch
 is known only to the senior staff of the Enterprise: commander, first officer, chief engineer, chief medical officer and ship's
 counselor. As designed he is programmed not to lie or deceive, recalls everything he's ever been exposed to, cannot use
 verbal contractions, and has super-human strength, dexterity, voice duplication, self-diagnostics, and "fully functional" male
 sexual abilities without the emotional attraction. Though he approximates fellow humanoid sleeping patterns and workshifts,
 he of course needs no actual rest and often takes the helm during the "night watch."

 Experiments into his direct input into or remote control of ship's systems have been uneven, but his unique abilities have
 been invaluable in securing the safety of ship and crew in numerous crises and far outweigh, in our opinion, any potential
 weakness they present.