Legal Disclaimer: This article provides general legal information about the Uniform Code of Military Justice. It is not legal advice and does not create an attorney-client relationship. Every case involves unique facts and circumstances. If you are facing charges under the UCMJ, consult with a qualified military defense attorney immediately.
Both Article 77 and Article 78 address involvement in crimes committed by others, but they differ in timing and level of participation. Article 77 Principals treats those who help commit a crime as equally guilty with those who actually perform the criminal act. Article 78 Accessory After the Fact addresses those who help offenders after the crime is complete. One makes you a co-perpetrator; the other makes you a helper after the fact.
The Timing Distinction
Article 77 Principals applies to:
Those who directly commit the offense
Those who aid, abet, counsel, command, or procure commission
Those present who assist in any way
Anyone involved in committing the crime
Article 78 Accessory After the Fact applies to:
Those who help after the offense is committed
Assistance to avoid apprehension or punishment
Actions taken when the crime is already complete
Post-crime assistance to offenders
Different Levels of Culpability
Principals under Article 77:
Are guilty of the underlying offense itself
Face the same punishment as the person who actually committed the act
Are treated as if they committed the crime themselves
Share full responsibility for the offense
Accessories after the fact under Article 78:
Are guilty of a separate, lesser offense
Face punishment capped below the underlying offense
Helped after the fact, not during commission
Have reduced (but still significant) responsibility
Article 77: Principals Explained
Under Article 77, any person is a principal who:
Commits the offense. The actual perpetrator.
Aids or abets. Helps during commission of the offense.
Counsels. Advises how to commit the offense.
Commands. Orders the offense to be committed.
Procures. Arranges for the offense to occur.
All principals are equally guilty regardless of their specific role.
Article 78: Accessory Elements
Accessory after the fact requires:
An offense was committed. The underlying crime occurred.
The accused knew the person committed it. Awareness of the person’s guilt.
The accused assisted the offender. Provided help to avoid capture or punishment.
Intent to hinder. The assistance was meant to help avoid justice.
The offense is the post-crime assistance, not the underlying crime.
The Critical Timing Line
Before and during the crime: Involvement makes you a principal.
Planning the crime
Serving as lookout
Driving the getaway car during the robbery
Holding the victim during assault
After the crime is complete: Involvement makes you an accessory.
Hiding the offender from police
Helping destroy evidence
Providing an alibi after the fact
Helping the offender flee
Typical Fact Patterns
Clear principal (Article 77):
Two service members plan a robbery together. One holds the knife while the other takes the money. Both are principals to robbery.
A service member serves as lookout while their friend breaks into a building. The lookout is a principal to the break-in through aiding.
One person orders another to assault a third party. The person who gave the order is a principal through commanding.
Clear accessory (Article 78):
After learning their roommate committed an assault, a service member hides them when MPs come looking. Post-crime concealment makes them an accessory.
A service member helps their friend destroy evidence after a theft is complete. Destroying evidence after the crime is accessory conduct.
Someone provides a false alibi for an offender after learning what they did. Post-crime assistance to avoid punishment.
The distinction:
Driving the getaway car during a robbery: Principal (during the crime)
Hiding someone who robbed a store yesterday: Accessory (after the crime)
Punishment Comparison
Article 77 (Principals):
Same punishment as the underlying offense
A principal to murder faces murder’s punishment
No reduction for being “just” a helper during the crime
Article 78 (Accessory After the Fact):
Generally limited punishment
Cannot exceed half the maximum for the underlying offense
If underlying offense carries death, accessory maximum may be limited further
The punishment difference reflects the different levels of involvement.
Why the Distinction Matters
For principals:
You’re guilty of the crime itself
Your punishment isn’t reduced for having a lesser role
“I just drove the car” doesn’t reduce your guilt
For accessories:
You’re guilty of a separate, less serious offense
Your punishment is capped
You weren’t part of the crime itself, just the cover-up
Accessories face serious consequences but not as severe as principals.
When Someone Is Both
Can someone be both a principal and an accessory?
For the same offense: Generally no. If you helped commit the crime, you’re a principal. The post-crime assistance is subsumed.
For different offenses: Yes. You might be a principal to one crime and an accessory to a different crime your friend committed.
Defenses
For principals:
No involvement in the offense
No intent to aid or abet
Withdrawal before the crime was committed
The offense wasn’t committed
For accessories:
No offense was committed
The accused didn’t know about the offense
No assistance was actually provided
No intent to help avoid justice
The accused was the victim or otherwise privileged
The Conspiracy Connection
Conspiracy (Article 81) overlaps with both:
Conspirators who participate become principals when the crime occurs.
Conspirators who help afterward may be accessories in addition to conspiracy liability.
All three articles can apply to the same person in a criminal scheme.
Practical Implications
If asked to help commit a crime:
Any assistance makes you a principal
“Just” being lookout is full criminal liability
You face the same punishment as the person who acts
If asked to help after a crime:
Helping makes you an accessory
Less punishment than being a principal, but still serious
The right answer is to report, not to help
In either case, involvement creates criminal liability.
Knowledge Requirements
For principals:
Must know the nature of the offense being committed
Innocent assistance without knowledge of criminality may not create liability
But willful blindness isn’t protection
For accessories:
Must know an offense was committed
Must know the person they’re helping committed it
“I didn’t know what they did” is evaluated against circumstances
Frequently Asked Questions
If I was just the lookout, am I really as guilty as the person who committed the crime?
Under Article 77, yes. Serving as lookout while another commits a crime makes you a principal. You aided the commission of the offense, which makes you equally guilty under the law. “I just stood watch” doesn’t reduce your criminal liability. You face the same potential punishment as the person who physically committed the act. The law treats all participants as equally responsible because the crime couldn’t have happened (or would have been more difficult) without your assistance.
What’s the difference between being an accessory after the fact and obstruction of justice?
They’re related but distinct. Accessory after the fact (Article 78) focuses on helping the offender personally: hiding them, helping them flee, providing false alibis. Obstruction of justice (Article 134) focuses on impeding the investigation or proceeding: destroying evidence, intimidating witnesses, lying to investigators. There’s significant overlap: hiding an offender both helps them (accessory) and impedes the investigation (obstruction). Both charges might apply to the same conduct. Obstruction can occur even without helping a specific offender (like destroying evidence or lying to investigators generally).
If I helped plan a crime but backed out before it happened, am I still a principal?
Withdrawal can be a defense, but it must be complete and communicated. If you withdrew before the crime was committed, clearly communicated your withdrawal to co-conspirators, and took no further part, you may avoid principal liability. However, the withdrawal must be genuine and timely. Simply having second thoughts while the crime proceeds doesn’t constitute withdrawal. If the crime happens using plans you helped create, your earlier participation may still make you a principal even if you weren’t present during commission. Consult with counsel about the specific requirements for effective withdrawal.