Final answer:
A DA form 1559 serves as an Incident Report in the context of whistleblower protection, providing rights and protection to federal whistleblowers.
Step-by-step explanation:
The purpose of a DA form 1559 is Incident Report in the context of whistleblower protection. In the Civil Service Reform Act of 1978, federal whistleblowers were provided with rights and protection against reprisals. The Merit Systems Protection Board, established by the act, hears complaints and conducts investigations into possible abuses. Additional acts like the Whistleblower Protection Act of 1989 and the Whistleblower Protection Enhancement Act of 2012 have further strengthened these protections.