They will love all those! It's nice for them to have a calendar for their own notes and countdown.
Ha! I also have some calendars I've been thinking about sending for "wall art." Some have beautiful pictures but are expired. Also, old dry-erase calendars with blank backs can be turned over or cut up and used as dry-erase note cards. The markers dry out quickly in desert environments, though.
I was surprised to hear from a couple of contacts last year that they really appreciated calendars - I wasn't sure at all when I sent them. I bought some, and got some free at local auto supply stores and farm supply stores. If you explain that you are sending care packages to soldiers, some car parts stores or repair shops will give you copies of their current calendars. Last year, I was given a stack with women and beautiful cars in lovely front yards or scenic spots. The women were wearing shorts and decent swimsuits, too - nothing tacky. Farm supply stores often have calendars with patriotic themes or scenery.