AF Form 348: Line of Duty Determination Guide (2026)

AF Form 348: Line of Duty Determination Guide (2026) – Line of Duty (LOD) determinations play a critical role for U.S. Air Force personnel, especially when an illness, injury, disease, or death occurs during military service. AF Form 348, officially titled Line of Duty Determination, serves as the primary document for documenting and adjudicating these cases. It helps establish eligibility for medical care, benefits, pay, and other entitlements while protecting both the member and the government.

This guide explains what AF Form 348 is, when it is required, how the process works, key sections of the form, and recent policy updates. It targets active duty, Air National Guard, and Air Force Reserve members in the USA.

What Is a Line of Duty (LOD) Determination?

A Line of Duty determination is an official administrative finding that assesses whether a service member’s illness, injury, disease, or death occurred or was aggravated while the member was in a qualified duty status. It also checks whether intentional misconduct or willful neglect by the member was the proximate cause.

Key possible findings include:

  • In Line of Duty (ILOD): The condition occurred or was aggravated in duty status without misconduct. This qualifies the member for full medical benefits, Medical Continuation (MEDCON) for Reservists/Guardsmen, incapacitation pay, and potential disability processing.
  • Not in Line of Duty – Not Due to Own Misconduct (NILOD-NDOM).
  • Not in Line of Duty – Due to Own Misconduct (NILOD-DOM): Benefits are typically denied if misconduct (e.g., DUI, intentional self-harm) caused the condition.
  • Existed Prior to Service – Not Service Aggravated (EPTS-NSA): The condition pre-dated service and was not worsened by it beyond natural progression.

The determination directly affects access to TRICARE, disability retirement/separation, survivor benefits, and other entitlements.

When Is AF Form 348 Required?

According to Department of the Air Force Instruction (DAFI) 36-2910, Line of Duty (LOD) Determination, Medical Continuation (MEDCON), and Incapacitation (INCAP) Pay, an AF Form 348 must be initiated in these situations (among others):

  • Death of a member in any duty status (including travel to/from duty).
  • Injury, illness, or disease that prevents the member from performing military duties for more than 24 hours.
  • Likelihood of permanent disability.
  • Any ARC (Air Reserve Component) member seeking medical treatment or incapacitation pay, regardless of duty loss in some cases.
  • Conditions requiring MEDCON or INCAP pay for Reservists and Guardsmen.

For Regular Air Force (RegAF) members on active duty, many medical treatments proceed without a formal LOD, but one becomes necessary for extended care, disability evaluation, or specific circumstances. Air Reserve Component (ARC) members (Traditional Reservists, Individual Mobilization Augmentees, Air National Guard) more frequently require the form to authorize care and pay when not on extended active duty orders.

Recent Update (Effective 2026): For ARC members activated for 31 or more consecutive days, approving authorities can issue “In Line of Duty” determinations under streamlined criteria without always determining the exact onset date (unless a commander requests a formal investigation). This change accelerates healthcare access and aligns procedures more closely with active duty members.

How to Obtain and Download AF Form 348?

Download the official fillable PDF directly from the Air Force e-Publishing site:
https://static.e-publishing.af.mil/production/1/af_a1/form/af348/af348.pdf

Always use the most current version from e-Publishing to ensure compliance.

Step-by-Step Process for AF Form 348

  1. Initiation: Usually starts at the medical treatment facility (MTF). A military medical provider completes the medical portion, providing a narrative of the condition, diagnosis, and opinion on whether it appears service-related or EPTS. Relevant medical records (initial diagnosis, treatment notes) are attached.
  2. Commander’s Section: The immediate commander conducts an informal investigation. They document the circumstances (duty status, what happened, dates), duty status at the time of the incident, and provide a preliminary recommendation (e.g., In Line of Duty or Not In Line of Duty). For ARC members, specific duty orders or AF Form 40A documentation is often required.
  3. Review and Adjudication: The form routes through legal review (in some cases), the LOD Program Manager, and the appropriate approving authority (often the Wing Commander for informal LODs). Complex cases may require a formal investigation using DD Form 261.
  4. Final Determination: The member receives notification of the finding. Interim LODs are valid for 90 days in some cases while the final determination is completed.
  5. Appeals: Members can appeal unfavorable findings through the ARC process or ultimately to the Air Force Board for Correction of Military Records (BCMR).

Timelines: Policies emphasize prompt reporting (ideally within 24–30 days of the incident). Informal LODs have target processing times (e.g., within 60–90 workdays depending on updates).

Required Supporting Documents (varies by case):

  • Medical records and provider statements.
  • Duty orders or AF Form 40A.
  • Commander’s informal investigation notes.
  • Member statements or witness accounts.
  • For Reservists: Specific forms like Member LOD Initiation Form and briefings (per HQ RIO guidance).

Key Sections of AF Form 348

The two-page form includes:

  • Member Information (Name, SSN, Grade, Organization).
  • Medical Treatment Details (Facility, date/time of treatment, diagnosis).
  • Duty Status at time of incident.
  • Circumstances (Detailed narrative by the commander – be concise but complete; avoid simply saying “see attached”).
  • Proximate Cause (Misconduct or neglect?).
  • Medical Provider Opinion.
  • Commander’s Recommendation and Signature.
  • Higher-Level Approvals and Final Determination.

Accuracy is essential— incomplete or poorly documented forms can delay benefits or lead to unfavorable findings. Members should provide all relevant evidence proactively.

Why Timely LOD Processing Matters?

A favorable ILOD finding unlocks:

  • Continued medical care and MEDCON orders for ARC members unable to perform duties.
  • Incapacitation (INCAP) pay.
  • Proper processing through the Disability Evaluation System (DES).
  • Protection of benefits for survivors in fatality cases.

Delays or unreported conditions beyond certain windows (e.g., 180 days in some Reserve contexts) may force members to pursue care through the Department of Veterans Affairs (VA) instead.

Tips for Air Force Members

  • Report injuries or illnesses to your commander and medical unit immediately.
  • Keep copies of all medical documentation and orders.
  • Work closely with your unit’s LOD Program Manager, Force Support Squadron, or servicing medical group.
  • For Air Force Reservists (especially IMAs), coordinate through HQ RIO/IRM where required.
  • Consult your local legal office (JA) or a military benefits counselor if the case involves potential misconduct or EPTS issues.
  • Stay updated via official sources, as policies (like the 2026 streamlining for extended orders) continue to evolve.

Official References:

  • DAFI 36-2910 (current version and guidance memoranda) — the primary governing instruction.
  • Air Force e-Publishing for the latest AF Form 348.
  • HQ RIO LOD page for Reserve-specific guidance.
  • Your installation’s medical and personnel offices.

For personalized assistance, contact your chain of command, servicing MTF, or the Air Reserve Personnel Center (ARPC)/appropriate Guard Bureau channels. Accurate completion of AF Form 348 protects your entitlements and ensures fair adjudication.

This article is for informational purposes only and is not a substitute for official legal or medical advice. Always refer to the latest DAFI 36-2910 and consult appropriate Air Force authorities for your specific situation.