Helmets for the "Nasty Nick?"

[CSB]

There is a book called "Chosen Soldier" about Special Forces Selection and Training. On page 98 is a photograph of soldiers going through an obstacle course. The caption recites:

"THE NASTY NICK. Swing through the air, crawl through the mud. The obstacle course at Camp Mackall tests the candidates during SFAS and Phase I."

OK, I understand that the former policy of placing concertina wire under the obstacles (as an added incentive not to lose one's grip) has given way to mud and water, in the manner of Ranger City Week, BUT...

the photograph appears to show the soldiers wearing plastic hockey helmets for the obstacle course. Is that the procedure now?