When I was in the Army I had several females in my platoon. We went on a 3 day field exercise. We were just getting set up and organized at our field site when one of the NCOs came up to me and said we had a problem. OK. What is it and it can be dealt with. He had a young lady with him and she said her period had started. She lifted the bottom of her shirt and you clearly could see the stain and she had no supplies with her. She had bled through her underwear and her fatigue pants. Pretty good size. We all had BDUs with a forest camo pattern and you could clearly see her stain. I told him to get back to the rear and let her get cleaned up and changed. He was also told by me to be very discrete. We never mentioned it again but she was grateful I did what I did.
Ew! I thought "being prepared" would have been part of the routine, but maybe she figured she was good for 3 days since her period wasn't due for 6 or 7. Nature has it's own clock, sometimes. Still... I would think she might have considered taking a few pads or tampons along anyhow.... for a friend, if nothing else. Which is why I am not in the Army, haha.
I thought the same thing but I felt it would be out of place to tell the females to bring pads and tampons. During this exercise I did have to give instructions to the female E5 Sergeant I had to get the panty liners and other related trash picked up from the sleeping area they used. They had 2 person tents and their own area to sleep. She wasn't fond of getting the task done but she did it after I told her I wasn't interested in how she did it but get it done.