Specialist Seven    

Officer shards can be obtained from completing the following missions: The Long Way Home Part 1, Part 5, and Part 8. It can also be gained through the Faction Store and occasionally through the Event Store and Event Rewards. Extra shards can be acquired through the Offers tab.

Icheb    

Officer shards can be gained through the Faction Store and occasionally through the Event Store and Event Rewards. Extra shards can be acquired through the Offers tab.

Infiltrator Tuvok    

Officer shards can be gained through the Faction Store and occasionally through the Event Store and Event Rewards. Extra shards can be acquired through the Offers tab.