These are the AFV crew helmets. The Van Doos were serving as an infantry battalion in First Canadian Infantry Division in Italy. The Universal Carrier in the background suggests that this is the Carrier Platoon, part of HQ company. The men are not wearing small packs, which also suggests the Carrier Platoon.
The dispatch rider helmet (motorcycle helmet) has a leather cover for the ears that is quite distinct. These all have the spring loaded chin strap.
The 44 pattern helmet (turtle helmet) was issued to 3 rd Division in Normandy as they were an assault division, landing on Juno Beach. I have never seen a turtle helmet in a photo in Italy.
Normally there is no cam net on AFV helmets to avoid the net catching on parts of the vehicle.
Keeping a reserve is like betting against yourself