Deployment (also being referred to as Reinforcement) is a global permanent stat that directly influences how many 
Troopers or 
Vehicles will be sent out to fight per wave. With each new wave the trooper counter will decrease by the reinforcement value. Note that the Deployment is capped at 20. To leave you something to achieve, certain vehicles with high Deployment costs won't be fielded unless you upgrade your Reinforcement bonus first.
Click this link to read more about vehicle deployment.
Deployment Costs
Trooper - 1.- Light Tank - 2.
- Helicopter - 2.
- Heavy Tank - 6.
Ways to Alter Deployment
Improving
- Recruiting Scouts (+1 per trooper).
- Upgrading to Out of Bounds (free Deployment for the owner of the skill).
Deteriorating
- Fielding Spies (-1 per trooper, if they deploy along the enemy lines).
- Utilizing Reverse Attack by your troopers (-2 upon use).
