He contributed to the team's defence.

He defended his opinion.

In order to succeed in this project, it is necessary to strengthen teamwork.

We hold meetings every week to strengthen teamwork.

He is making a model of a battleship.

This battleship has enhanced antiaircraft capabilities.

Let's try the new function of this machine.

How does this machine function?

He is an expert in surface-to-air missiles.

He has problems with executive functioning.