If you complete the 'Project Chrysalis' Assignment Chain, you get access to a repeatable assignment, 'Reintroduce Additional Volunteers Into Society' - Recruitment assignment, right?
If you complete any of the Star Cluster Colonization chains, you get a Colonization assignment with a chance for a DOff if you Crit.
If you complete 'Shadows of the Jem'Hadar' chain, you get a Recruitment assignment with a chance for a Cardassian DOff if you Crit.
If you complete the 'Caitian Disporia'/'Unforgiven of Ferasa' chain, you get a Military assignment that unless you fail the assignment you'll get a Ferasan Flight Deck Officer of appropriate quality.
But as near as I can tell, even if you manage a Critical Success on 'Reintroduce Additional Volunteers', you just get the basic rewards, maybe in a bit higher quantity. From the name of the assignment, it just seems fair to expect that you could get a Telepathic/Telekenetic DOff. I mean, you got Mochak/Elizabeth Mohr from 'Reintroduce Volunteer Into Society', so 'Additional' gives the feel that there's more of them.
To be honest, it actually makes me wonder if the Assignment is complete or if it was actually originally intended to be another 'DOff on Crit' and that ended up not being included for some reason.