my husband is in Iraq at the moment, but when the kids were small i used to joke i would stick a picture of him up by the front door so the kids would know he wasn't a stranger and to let him in when he got home!
After his first tour away for six months, he arrived back in the evening after my daughter (3) was asleep, the next morning she snuck around my side of the bed and whispered, whose that man? We had shown her a picture of her dad so often the poor kid thought her dad was a photograph!
i forgot to add, during a fire fighter strike in England, my husband's army unit was sent to cover their shifts. He had the time of his life ridding on the truck and playing with the hoses, he said it was the best week of his life! Its funny, not one of the guys who went complained about the extra work or being away from home, they were to busy having a great time... big kids!