Helmet markings

I found a picture of personnel from the 30th Infantry Regiment preparing for the invasion of southern France. In the bottom left of the picture, you can see the GIs and on the backs of their helmets, you see what looks like either an H or two vertical lines. It was my understanding that two vertical lines indicated captain's rank, so I doubt we're looking at a bunch of captains. Is this Company H of the 30th?

EDIT: I also see someone carrying a mortar, further leading me to believe this is a heavy weapons company?

2nd EDIT: I also just noticed that there's no 3ID insignia stenciled on the sides of the helmets. Odd.

 

I looked again, it's not a mortar, looks like the tripod for a 30-cal or something.

 

Jeff, I am on a decent desktop and cannot see the pictures either.......Gaines

 

cant see image either just broken link icon, see attachment

 

Grrr... the link is down but I happened to save the image. I uploaded to photobucket and now the linked image above might be too low resolution to see the the markings. Not sure what to do about that.

EDIT: Uploaded to Google Drive, here's a link that might work better: https://drive.google.com/file/d/0B-15mpuUkThFUFBfSXFXTUYtVjg/view?usp=sharing

 

Not seeing an "H", just two vertical bars...Perhaps, 2nd battalion?

 

Ah! Never thought of that. You could be right.

 

Super photo, full of interesting details.
havent a clue as to your query but was worth seeing the zoomable pic.

 

Alright, form two lines, as you pass the truck you will draw one lifebelt, inflatable.

 

Looks like its a Machinegun Section: Guy in front carrying water cooled .30, followed by the guy in back with the tripod. The helmet markings could really mean anything; especially considering that there are two machine gun teams with the same markings, my guess would be that the two stripes meant "Machine gun". It could be an organizational marking or something to alert other troops to not advance past their position....I just don't know.

EDIT: Closer Inspection

There are about 30 guys in the picture that have those marks, and my guess is that it denotes the platoon

 

My guess is that they might be some sort of reflective tape or paint. So if any light hit them at night, the people behind them could follow them and know they were friendly. Just a guess though since I am not sure when the cat eyes were put on helmets for that reason like they are today