For the subset of users who have both Uniform and Civil Service accounts and may be interested in combining them for ease of management in retirement, I just completed a merger and thought it might be helpful to share:
1. TSP Form 65 is easy to complete; must be snail mailed.
2. You can specify which account you want to move.
3. The merger happened exactly one week after I mailed the form.
4. I received no notification that the merger had taken place.
5. (Main Point

): The moved account will go into the fund(s) you have specified for Contributions irrespective of the fund(s) that the original money came from. In my case, the dollars in my Uniform account were in the G Fund, but in my Civilian account I had specified that all new contributions should go to the S Fund (poor man's DCA). So, when the dollars were moved from my Uniform account to my Civilian account, they went from the G Fund to the S fund...and I didn't have to burn an IFT to make the switch.