These paratroopers are specialized in reconnaissance.

A reconnaissance satellite is a military satellite capable of monitoring many activities on earth, eavesdropping on lines, registering the operating frequency of the radar systems...

We were here on a reconnaissance mission.

The mercenaries spied a military aircraft conducting aerial reconnaissance over the area.

You have been up to the scene of the crime, I understand," said the Colonel. "Yes; the Inspector and I have made quite a little reconnaissance together."

The aircraft was conducting aerial reconnaissance.