Holidays as a Police officer's wife

This year marks the the third year that my husband has been a police officer at Christmas time.  It really sucks sometimes.  I have to remember EVERYTHING that is important for our children for Christmas, and I'm so scared that I am going to forget something.  My family is big and we have tons of Christmas obligations.  Today is the day before Christmas Eve and we had our family celebration with my dad's side.  Mike really wanted to go, but he is on night shift right now.  Last night they had a busy night and he didn't get home until 9:30am.  (usually the are off at 7)  I knew there was no chance of him getting up to go eat lunch at 12!  So I have the obligation of loading the presents in the car, getting three children dressed and ready, plus trying to throw something on me to look half way decent.  While I enjoy the time with my extended family, I hate that Mike doesn't get to see Aubrey SOOO excited to open her presents.  She is three this year and is really understanding what Christmas is.  I try to be the good wife and make my husband a plate of food and bring his presents to him. He's too tired to enjoy either.  The kids are so excited and want to show him all the stuff they got, but I have to remind them over and OVER that daddy is sleeping because he worked last night and has to work again tonight.  By the time he wakes up all he has time to do is wash and eat.  Tomorrow brings yet another enduring task of keeping the kids quiet so daddy can sleep and another day of getting three kids dressed and ready, presents loaded, and go to my mom's side to celebrate Christmas Eve.  He says he is going to try to go for a while, but I know that he is pushing himself.  He's already worked four nights in a row.
Now, my wonderful husband, who I love, has to do the stupidest thing ever and VOLUNTEER himself to work private security for a certain company on CHRISTMAS EVE!  When he told me this I was freaking mad!  I mean seriously, Christmas Eve?  With his work schedule it's rare that he has a holiday off.  He finally has Christmas Eve off and what does he do... yeah.  So anyway I got over it when he told me how much money it pays.  We could use it, but then that leaves me playing Santa.  When he gets home he's going to be so tired, and we still have one more Christmas celebration at my parents house.  This is such a long explanation, but being an officer's wife can be tiresome.  Sometimes you really do feel like a single parent.  The worst part is that the whole time we are off celebrating, and I'm trying to make my kids' Christmas as special as possible, I am worrying about my husband.  It is starting to get a little better after three years, but it's always in the back of my mind that he could get hurt or worse.  How would I tell my children?  What would I do?  These are things that are constantly present in our lives.