Destroy 3 Fireflies

How do you complete "Destroy 3 Fireflies"?

This is step 2 of 4 in Shoring Up Defenses, given by Apollo. It is completed on Riven Tides.

• Shoring Up Defenses
• Riven Tides

What are the other objectives in Shoring Up Defenses?

Shoring Up Defenses has 4 objectives in total: Destroy 5 Wasps, Destroy 3 Fireflies, Use 1 ARC Alloy to reinforce the Raider structure on top of any Stacking Yard crane and Board up shuttered windows in the hotel.