Which form is used to report an SIR?

The correct form used to report a Serious Incident Report (SIR) is UF 190-4.2. This form is specifically designated for documenting serious incidents that may require further investigation and accountability within Army operations. Reporting such incidents accurately is crucial for maintaining operational integrity and ensuring appropriate responses to any issues that arise.

The other forms mentioned are related to different reporting and administrative functions within the Army, such as tracking various types of incidents or administrative actions, but they are not intended for the specific use of recording a Serious Incident Report. Understanding the specific uses of each form helps ensure that incidents are reported correctly and efficiently, thereby allowing for proper follow-up and resolution processes.