Yes - if you want to "trade up" it's a 5 to 1 progression all the way.
5 Grey = 1 Green5 Green = 1 Blue5 Blue = 1 Purple
Grey DOFFs used to be pretty cheap to get on the market, but now that they're used as fodder for the Starbase system they're more expensive.
The best way to get DOFFS if you're on the cheap is to go to the various recuitment officers at either the Starfleet or KDF academies. I'm not sure if I recall where you do that for Rom Captains. I think it's in the New Romulus area (the exclusively Romulan section).
Once there, look around and find a Personnel Officer. You can either do that 5-1 trade-off mission there or do a recruitment mission. The recruitment missions will tend to get you a lot of grey officers. And you have to have some patience with it. But hey - it's free.
5 Grey = 1 Green5 Green = 1 Blue5 Blue = 1 Purple
Grey DOFFs used to be pretty cheap to get on the market, but now that they're used as fodder for the Starbase system they're more expensive.
The best way to get DOFFS if you're on the cheap is to go to the various recuitment officers at either the Starfleet or KDF academies. I'm not sure if I recall where you do that for Rom Captains. I think it's in the New Romulus area (the exclusively Romulan section).
Once there, look around and find a Personnel Officer. You can either do that 5-1 trade-off mission there or do a recruitment mission. The recruitment missions will tend to get you a lot of grey officers. And you have to have some patience with it. But hey - it's free.