While Alden was officially attached to the sciences division, Alden split himself between various assignments aboard the Enterprise, including communications, navigation, and engineering. In early 2265, Alden was the communications officer on duty when the Enterprise was assigned to try and deflect a rogue pulsar from decimating the climate of Mestiko. (TOS - Mere Anarchy eBook: Things Fall Apart)
In 2265, Alden and Lieutenant, junior grade Joe Tormolen met up with Hikaru Sulu in the Enterprise's botany lab, and then proceeded to attend Lee Kelso's memorial service in the ship's chapel.
Shortly after, Alden transferred to the Delanos VI research colony where his fiancée had just been appointed as an administrator at the colony.