If you know active duty service personnel directly:
Collect items to ship that are meaningful for your deployed service member. Personal gifts can help them to feel emotionally connected despite their distance. Drawings from children, hand-written letters from family and friends, and printed photos are perfect examples. A USB or external drive can include their style of music, movies or home-videos to provide hours of entertainment. Despite not being with you for a home-cooked meal, you know their preferences for non-perishable foods or their favorite sauce/flavoring packets to enhance their meals.