A physical or mental condition that substantially impairs the covered veteran's ability to secure or follow a substantially gainful occupation by reason of a disability or disabilities related to military service is a condition that makes it difficult for the veteran to work. This is also known as a service-connected disability. A condition that is a continuation of a serious injury or illness that was incurred or aggravated when the covered veteran was a member of the Armed Forces is a condition that was caused by the veteran's military service and requires ongoing care. This could include conditions such as traumatic brain injury, spinal cord injury, or amputation.