Eva and Chengli willingly went on the reconnaissance run, and even brought three cadets each. They didn't mind all that much that they were doing this, it was just that there were others who were more proficient at it.
Although they were relatively well-versed in stealth and recon, Sunflower had practical military experience, and that was too valuable a resource to let sit. So they invited her to join them as a force multiplier.
She quickly joined the team with three cadets of her own and offered her expertise whenever she could. The more they understood about the situation, the better their decisions could be, simple as that.
The first thing they did was kick up a cloud of dust around themselves. They wanted to get a nice, thick layer of it to help keep them camouflaged. Whether or not this was helpful against drones wasn't really an issue.
What was important was that they attempted to disguise themselves with as many means as possible.