Deployable means that something is easily moved to a place where it's needed.
When something is deployable it means that it's able to be moved to a place where they can be used when they are needed.
For example soldiers would be deployable.
Such as the soldiers were deployed to Iraq.
The firefighters were deployed to another state to fight the fire.
The word deployment can mean different things, depending on your service member's job, unit and service branch.
Generally, deployment means a scheduled time away from the normal duty station, usually outside of the United States.
Deployed can also mean to arrange in a position of readiness, or to move strategically or appropriately: to deploy a battery of new missiles.