Deployments are a bear - what you are feeling is totally normal.
We are navy and on our 3rd deployment, and have done many underways (gone for about 2 months at a time for the underways). We did the math - at the end of this deployment, my husband will have been underway or deployed for 93% of our marriage. Yuck!! So basically, I can relate. It does get a little easier. But I have to say that you are very fortunante - we are unable to video chat/call unless the boat is in port, so for a year long deployment I get 3 to 5 phone calls. Talking every day would be great.
Everyone is saying don't cry on the phone - I think you need to do what works best for you and your husband. My husband and I prefer to have open communication about our emotions. He says it is easier to know that life is rough for me and he can try to be supportive than to feel like I am hiding my feelings from him. I feel the same way - we are in this for the long haul and that means a "stiff upper lip" inhibits our communication and thus our relationship. Talk about what will be best for each of you and do that.
I do my best to stay calm with the kids (I have a 2 year old and a 6 month old). We talk about our emotions in a calm way - I tell the kids I feel sad and I miss daddy, but I don't cry infront of them. That kind of raw emotion is hard for them to watch their mom go through at that age, and they have enough stress as is. But it is important for them to know that it is ok to be sad and miss daddy.
For us, we talk about what season daddy will come home, because my toddler doesn't get months quite yet and that makes it easier for her. She has a bearinsten bears (spelling?) book about seasons and we talk about how it is summer now, and then we will have fall and what that will be like, and the winter and then spring, and daddy will be home in the spring. So there are also physical changes she can watch for to know it is getting closer to "daddy time" (like leaves changing color, snow, etc). She tells me many times each day that daddy will be home in the spring time and he will walk through the front door. I tell her that is right and blink back the tears that form.
So basically, deployments are rough, you are not alone, and it is really hard for toddlers to wrap their minds around, so try to give them a sence of stability and confidence that daddy will come home.
Hugs!