Tap Promote button on the bottom of Officer Stats interface to promote the officer.

Only the officers which have reached the max levels can be promoted.

1-star officers need to reach Lv. 10 before they can be promoted.

2-star officers need to reach Lv. 25 before they can be promoted.

3-star officers need to reach Lv. 40 before they can be promoted.

Promote Cost

Specific amount of Ordinary Supplies and Special Supplies will be cost when the officer is promoted.

Types of Special Supplies correspond to Types of officers: Exploration Supplies, Military Supplies, Defense Supplies, Logistics Supplies, Technology Supplies.

The more Stars the officer are promoted to, the higher level and larger number of Supplies will be cost.

You can view the promotion supplies you have under Materials on Officer interface.

After the officer is promoted, specific powerful officer skills will be unlocked.

The required officer stars to unlock officer skills can be viewed on skills info by tapping skills icon.

Materials Source

Win the battles of Special Operation to get various materials to promote Officers.