Retire from the military with a full career of service and you've earned a retirement check. Get rated disabled by the VA and you're owed disability compensation too. For a long time, having both meant losing a dollar of retirement pay for every dollar of VA compensation received, an offset that surprised a lot of new retirees the first time they saw it on a statement.
Two programs exist specifically to undo that offset, at least in part: Concurrent Retirement and Disability Pay (CRDP) and Combat-Related Special Compensation (CRSC). They work differently, they aren't available to everyone, and in some cases you have to choose between them. Here's how each one works and how to think about which one fits your situation.