Keenser
Officer shards can be earned by completing the following missions: Gone Too Far, No Good Deed Goes Unpunished, and Special Delivery. Additionally, shards can be gained through the 7-day Loyalty Chest.

Carol Marcus
Officer shards can be earned through the Ultra Officer Chest, Premium Officer Chest, 30-day Loayalty Chest and, occasionally, through the Rotational Ultra Chests. You can also exchange Transporter Patterns for extra shards.

Officer 0718
Officer shards can be earned by completing the following missions: No Stone Unturned and Shadow Boxing. Additionally, shards can be gained through the Premium Officer Chest.

Gary Mitchell
Officer shards can be earned through the Ultra Officer Chest, Premium Officer Chest and, occasionally, through the Rotational Ultra Chests. You can also exchange Transporter Patterns for extra shards.

Jabilo M'Benga
Officer shards can be earned by completing the following missions: Combat Training 17: Rookie, Combat Training 17: Soldier, and Combat Training 17: Veteran. Additionally, shards can be gained through the Standard Officer Chest.

Zahra
Officer shards can be earned by completing the following missions: Combat Training 16: Rookie, Combat Training 16: Soldier, Combat Training 16: Veteran, Conspiracies, Delegation, and Missing in Action. Additionally, shards can be gained through the Standard Officer Chest.