Husband just joined the army

Jessica
My husband just signed up for the army and will be leaving for boot camp soon ( i'm very proud of him)we have two kids our oldest is almost two and our youngest is three months. My oldest is very attached to my husband and has separation anxiety ( he freaks out even when one of us goes to get grocerys 😕) I'm also nerves that since my youngest is only 3 months she will have a hard time when he comes back does anyone have any advice on how to make this transition easier on them and how to keep the kids connected with their dad while he's away, he will be gone for 10 weeks at boot camp and then 26 weeks for A school. Any advice would be appreciated 😊