I only have one and she is back in school. Here's a thought for you- how are you at writing? Writing can be done in chunks of time and breaks can be taken. Start your own blog about being a Navy wife, life in the Navy, or any topic that you're interested in.
Write blog posts for others. Start a virtual assistant business- I went through Gina Horkey's Fully Booked Virtual Assistant Course and it's great. They show you how you can make good money but work full-time. I know, it sounds funky but it's legit, I promise.
Sarah Titus dot com is a good site to look at. One of her courses is about designing items such as: sayings, coloring pages, etc BUT digitally and starting a Shopify store- you design ONE time and continually sell.