My first thought upon seeing that picture was how little I'd like to be lying across barbed wire and have a mate land his bloody big size 9 hobnailed boot with full weight in the small of my back.
As for the RM photo, I think the bloke in the dark BD is the QMS. It appears he's arming the grenades for issue while the Sgt. is issuing the Bren magazines. That is a Boys parked on the deck.
What is slightly surprising is that they have No. 4 rifles. Given that some units were still equipped with SMLEs when they landed at Normandy almost a year later, I'd have suspected ships' company Marines would have been further down on the SMLE to No. 4 change over list.