A PCS move looks simple on orders: report to the new duty station by a certain date. In practice it's a tangle of separate entitlements, each with its own rules, paperwork, and timing, and most service members don't realize how many moving parts there are until they're holding a stack of receipts and a move-in-progress bank account.
Some costs get reimbursed automatically. Some require you to file a claim. Some categories that feel like moving expenses aren't reimbursable at all. Knowing which is which before you move saves money and prevents a frustrating claim denial after the fact.