Operational Mastery - Mass Effect 3 wiki

Rank 1, Operational Mastery:

• Be an expert tactician on and off the battlefield

Rank 2, Influence and Capacity:

• Increase reputation bonus by 4%
• Increase weight capacity bonus by 20 points

Rank 3, Influence and Sniping:

• Increase sniper time-dilation by 10%
• Increase weapon damage bonus by 2.5%
• Increase reputation bonus by 4%

Rank 4, Weapon Damage OR Influence and Duration:

• Increase weapon damage bonus by 5%
• Increase power damage by 10%

OR

• Increase power duration by 25%
• Increase reputation bonus by 8%

Rank 5, Squad Bonus OR Weight Capacity:

• Increase squadmate weapon damage by 10%
• Increase squadmate power damage and force by 15%

OR

• Increase weight capacity bonus by 35 points

Rank 6, Damage and Duration OR Sniper Damage:

• Increase power damage and duration by 25%

OR

• Increase sniper rifle damage by 15%
• Increase headshot damage by 15%