Military Court Rules on Aiding and Abetting in 2026
A US soldier was convicted of manslaughter after helping a friend who killed two people — but the appeals court used a legal theory the prosecution never argued at trial. In November 2026, the US Court of Appeals for the Armed Forces struck that down, ruling that due process bars appeals courts from switching theories after conviction. The decision has implications for anyone — including immigrants — facing court proceedings where the government's legal theory shapes the entire case.
What if a court convicts you under a legal theory the prosecution never actually argued at trial? That is exactly the question the US Court of Appeals for the Armed Forces (CAAF) answered in November 2026 — and the answer matters for anyone facing military justice proceedings.
The case involved Army Specialist Phillip E. Thompson Jr., who in 2017 drove a friend, Sergeant Shaquille Craig, to another soldier's apartment and helped him get inside. Once in, SGT Craig shot and killed two soldiers. The government charged Thompson with premeditated murder under an aiding and abetting theory — meaning prosecutors argued Thompson helped Craig commit the crime, not that Thompson pulled the trigger himself. The military judge acquitted Thompson of murder but convicted him of two counts of involuntary manslaughter as a lesser included offense.
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The Army Court of Criminal Appeals (ACCA) then affirmed the conviction — but under a different theory: it said Thompson could be convicted as a direct perpetrator, even though the government had only argued aiding and abetting at trial. The CAAF, in its November 2026 decision written by Judge Hardy, rejected that move. The court held that due process requires an appeals court to review a conviction only under the theory the prosecution actually presented. Switching theories on appeal, the CAAF said, violates a defendant's right to fair notice. The court sent the case back to the ACCA for a new review limited strictly to the aiding and abetting theory.
Why this ruling matters beyond the military
This decision reinforces a principle that applies broadly in US criminal law: the government must prove its case using the theory it argued, and courts cannot rescue a conviction by substituting a different legal theory after the fact. For immigrants in removal proceedings (the court process to decide whether someone is deported), a related principle applies — immigration judges and appeals boards are also supposed to limit their review to the charges and theories actually presented. If you or a family member faces any court proceeding — immigration or criminal — the specific legal theory the government uses matters enormously for your defense.
What to do
- If you are in any court proceeding — immigration court, criminal court, or military court — ask your attorney exactly which legal theory the government is using against you. Your defense strategy depends on it.
- If an appeals court or immigration appeals board affirms a decision against you using reasoning that was never argued at the original hearing, lawyers say you may have grounds to challenge that decision. Document everything from your original hearing.
- Keep copies of all court orders, transcripts, and government filings. If the theory changes between hearings, that record is your evidence.
- Consult an immigration lawyer if a criminal conviction — even a military one — is part of your background. Criminal findings can affect green card applications, naturalization, and deportation defense.
What to do, step by step — see our guide “Appealing to the BIA”.
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This CAAF ruling reinforces that due process requires the government to commit to a theory of liability before trial — and courts cannot rescue a weak conviction by substituting a new theory on appeal. In immigration court, the same logic applies: if DHS charges you under one ground of removability, an immigration judge generally cannot sustain removal on a different, uncharged ground. If you believe an immigration judge or the Board of Immigration Appeals affirmed a decision against you using reasoning that was never argued at your original hearing, you may have grounds for a federal court petition for review. Speak with an immigration attorney to evaluate whether a due process challenge applies to your specific case.
Frequently Asked Questions
What does 'aiding and abetting' mean in US law?
Aiding and abetting means helping someone else commit a crime. You do not have to be the person who directly commits the act — if you knowingly assist, you can be held legally responsible. In immigration court, a criminal conviction for aiding and abetting can count the same as a direct conviction for purposes of deportation or green card eligibility.
Can a court convict me under a theory the government never argued?
According to the CAAF's November 2026 ruling, no — at least not on appeal. Due process requires that you have fair notice of the legal theory being used against you. If an appeals court affirms your conviction under a completely different theory, that may be grounds to challenge the decision.
Can a military conviction affect my immigration status or green card?
Yes. A military court-martial conviction is treated as a criminal conviction for immigration purposes. Depending on the offense, it can make you deportable, bar you from getting a green card, or disqualify you from naturalization. An immigration lawyer can review the specific conviction and advise on the impact.
What is a 'lesser included offense' and why does it matter?
A lesser included offense is a less serious charge that is automatically part of a more serious charge. For example, involuntary manslaughter is a lesser included offense of premeditated murder. If a judge or jury finds you not guilty of the bigger charge, they can still convict you of the lesser one — as happened in Thompson's case. This matters in immigration proceedings because even a lesser conviction can trigger deportation grounds.