Maybe some kind of witch doctor in a black helmet or something.

Who are those other guys, in the funny black helmets?

He reached up and pulled the black helmet off, held it under his arm.

Light glinted off the black helmet of short cut hair.

The lightweight black helmets covered their faces except for the eyes.

A black helmet was lowered over his head, with only a tiny glass viewing window in the front.

"We haven't seen a black helmet since dawn, that's what trouble!"

She took off her big insulating jacket and the black helmet.

Then it was time to pull on his black helmet and return to the tattered field.

He stood on his toes, reached up, and seized the black helmet in both hands.