Your "Iraqi" canteen looks like a copy; the cap is a little odd and so is the attachment of the chain to the canteen body. The second, unmarked canteen maybe good; I can't tell for sure but possibly post WW2. The chain is unusual and so is the collar it's attached to. The khaki cover is good and a very nice example. The third cover, the green one, is a M1956 cover, used in Nam until they were eventually replaced by a nylon cover in the mid 60's. It should have two Alice clips on the back, but has been modified with homemade wire attachments.