Fetching details from the dictionary...

war potential; military strength; fighting power
ability (to compete); capabilities; valuable asset
敵の戦力を分析して作戦を立てる必要がある。
We need to analyze the enemy's military strength and develop a strategy.
新人選手がチームの重要な戦力となった。
The rookie player became an important asset to the team.
彼は戦力外通告を受けてチームを去った。
He left the team after being told he was no longer needed.