Combat instructor Marine Corps

My husband just got approved for Combat instructor duty. From what he's told me he'll be hella busy for those 3 years. Anyone got experience with this? I'm planning on getting pregnant within the next year, do you know if he'll still get the 3 months paternity leave? I'm a little anxious how I'll cope with my now 9 month old (by then toddler) and then possibly a newborn on top, but I don't want a large age gap as I'm already 30 and want them close together. Please tell me I'll be fine and can do this, single moms do it I will be able to handle this right? 🥺