If you found out your Leader or Immediate Supervisor was doing something against the law, like fraud, what would you do?

Was what the supervisor doing a violation of the UCMJ? If so, report that person to the higher authority. Everyone in uniform has a duty and responsibility to maintain good order and discipline.

Colonel, this should be a "no brainer" for folks who have got it packed in a sock. Once one has established that the situation is indeed a valid issue and not some rumor monger whoes gone off the reservation with some yahoo story, then indeed that is why you have a chain and the Military Police. There is no "comfort time" for a criminal and it would not be wise to prolong the situation any longer than needs to be. Its simple, "Do the crime, do the time." This person, by their behavior has sold out the honor and integrity of every officer and member of their command and at the end of the day when all we have left is pocket change we do have our honor and integrity and somedays that will buy you a whole lot more at the company store than being some nice guy social worker. I may sound hard core, but I have a hard time with someone who veered off course and ran aground because of their personal greed. No Sir, I've not encountered anyone at anytime in my career who sold themseves or the organization out by their greedy faudulent actions. I've been fortunate to have good senior officers and crew to work for and with.

On my first tour as US Air Attache to Nicaragua and first of four tours to US Embassies, I arrived to my Boss, the Defense and Army Attache under investigation for travel fraud and removed from the Defense Attache Office. The Defense Intelligence Agency (DIA) had not briefed me he was under investigation or that I would be arriving to be Acting Defense Attache out of fear I would back out of the assignment leaving 2 empty slots that take 3 years to fill. I arrived to the departing Air Attache being angry and jealous that he was not going to be the Acting Defense Attache and refused to do an amicable turnover. Then he caught Dengue Fever and could not fly for 2 weeks because he could suffer neurological damage from high air pressure. Meantime the US Ambassador had never been told the Defense Attache was fired and would not be returning. At the same time a Foreign Service Officer who had been his Girlfriend for 2 years despite his being married kept calling to know his status. In the midst of all of this, I was told one of my only two NCOs might be sexually abusing his 3 children to have to return his family to the US for a CID investigation. That required informing the US Ambassador who convened a Child Abuse Group to hear the allegation and recommend the family be sent back to the US. Once his family was in the US, DIA refused to have the NCO return because he now supposedly posed no issue to his family but more importantly because they didn’t want to have to replace him. But how can a family begin to address its issues when the head of the family is overseas and everyone else is in psychological counseling. Getting him removed and returned to the US required I write my own investigative report along with authoring a professional consult on his likely being a sexual molestor which luckily I could do having been a Special Agent and Forensic Science Officer, which I then submitted to the IG, DIA. And he was on the next flight back to the US! Then Hurricane Mitch struck and because I was the only person in the US Embassy of 60 Americans to realize we had a Category 4 Hurricane became the US Ambassador’s Point Person for US Assistance to Nicaragua to include being the Head of Emergency Operations coordinating food, plastic and relief supplies for 6 months and then 18 months being Head of Reconstruction and Recovery hosting 42 VIP visits; 45 damage assessments, overseeing arrival of 9 helicopters and aircrews with billeting, messing, and transport; planning search and rescue and medical evacuations; identifying the location of 100 Peace Corps Volunteers, writing and securing the first US Nicaragua Status of Forces Agreement, housing, billeting and transport for 1800 arriving US troops for 6 months, planning of road and bridge repairs. On top of all of this my baggage and household goods were declared lost! I became the first US military officer in 30 plus years to wear a US military uniform every day for work in Nicaragua! My old Boss went onto his dream job, Chief Engineer for the Oklahoma National Guard! Try explaining to overworked, under appreciated NCOs why a Colonel didn’t get a slap on the wrist and retained his full rank and pension!

Check the regulations about any infraction, it’s says the same thing regardless of the service branch. It’s not only an obligation to report it; it’s a requirement.
It’s shocking to me just how many members never read their service regs.

The Core Values in the Navy and Marine Corp is "Honor, Courage, Commitment". Courage is not always referred here in a combat situation but having courage to stand up when you see something that is wrong. Sometimes in doing so takes an amazing amount of courage. It is part of the Core Values for just that reason. If you see something being done that is wrong stand up and say it even if it is your superiors. It is part of the Core Values. Honor also plays a part. None of this comes easy.

The professional move is to receive just enough info to validate if it’s legitimate and tell the NCOIC (1SG). If you feel that position is compromised and connected you inform the Commander. That goes both ways. Meaning if the CDR is compromised then you tell a different Commanding Officer or SR NCOIC. You can absolutely not get into trouble for following UCMJ and the law. This also applies to Field and General Grade. Even they pay the piper. The chain of Command goes all the way to the White House and God forbid you do what your rank can handle. The law is the law.

If your worth your salt, you will go to company gunny and report what YOU know* Just look into the mirror and ask is this right thing to do*

Maybe I'm old school, but unquestionably, yes, no matter the consequences. Right is right; wrong is wrong.

I have dealt with this both in and out of the military. Each time I would gather evidence and send it up the chain of command, of course going over the head of the boss doing wrong. I did this anonymously. Now the higher ups know something is amiss, they can deal with it or not. I felt like I did my part. I leaned the hard way about reporting unlawful stuff personally. Many bosses have powerful allies.

Turn them in!