Any “concerns” he might have had should have been addressed up his Chain Of Command, the nanosecond he made it public he violated the UCMJ and subject to the consequences. NO sympathy for him, as a senior commissioned officer he knew better.
HIS lack of judgment earned him his fate.

Not that I believe anything Vindman claimed to have heard, Who authorized Vindman to eavesdrop of Head of State communications?

I find it extremely disturbing how many people here find it okay that an officer in the United States Army participated in a coup attempt.

When I was preparing to campaign for a political opponent while still active, I had to go though a very strict course by the JAG on what I could and could not do. Especially while in uniform. This officer used his rank and position to spread false innuendo about the commander-n-chief. There is in no way any room for such blatant disregard for political infiltration of our Military personal in the police campaign for our against a President. Now if he had FIRST HAND knowledge of the President doing something illegal then he reports that using what we all use, the damn chain of command. He hated the President and he allowed himself to be used like a wet rag to further one parties agenda against a setting president. And that should have landed him a court martial at the least.

If I were the convening authority, LTC Vindman should be charged in a General Court Martial

He’s guilty of Articles 81, 88, 89, 92, 107, 131 and 133.

Article 81 conspiracy. Sentence commensurate with most serious charge. In other words, another life in prison.

Article 88 contemptuous words. 1 year in jail. Dishonorable discharge. Loss of all pay and allowances.

Article 89 insubordination to a superior officer. One year confinement. Dishonorable discharge. Loss of all pay and allowances.

Article 92 Failure to obey a lawful order.

Article 94 Sedition. Life in prison.

Article 106a Espionage. Life in prison.

Article 107 false official statements. Dishonorable discharge. Confinement at hard labor for five years. Loss of all pay and allowances.

Article 131 Perjury. Loss of all pay. Five years confinement. Dishonorable discharge.

Article 132 Fraud against the government. 5 years confinement. Loss of pay and allowances. Dishonorable discharge.

Article 133 conduct unbecoming. 5 years confinement. Loss of pay and allowances. Dishonorable discharge.

And all of the following: Article 134-12. Disloyal statements.

Article 134-19. False swearing.

Article 134-5. Obstruction of justice.

Article 134-40 falsifying public record.

Article 134-38 solicitation of an offense.

So, in reading through a number of responses to the question poised; how many of you typed "Corruption in the Ukraine" into the search bar and hit enter then read all the entries??? Don't use "Google" it's biased but, "Duck Duck Go", "Bing", "AOL", even Microsoft Edge gave some surprising results.
https://www.breitbart.com/politics/2019/11/19/alexander-vindman-admits-making-up-parts-of-trump-call-summary/
https://www.washingtonexaminer.com/news/analysis-democrats-have-a-col-vindman-problem
https://www.americanthinker.com/articles/2019/10/corrupt_senators_took_ukraine_cash.html
https://eurasianet.org/a-brief-history-of-corruption-in-ukraine-the-poroshenko-era
https://www.dw.com/en/ukraines-anti-corruption-campaign-targets-klitschko-and-poroshenko/a-49816916
So my question is; Who or what was LTC Vindman covering up??

When 38% of America follows a moron who is a puppet to a formidable enemy and former KGB agent, the the institutions Of democracy.are shaken.
LTC V will be alright.

He did the right thing, rest assured.

Our other is to the Constitution, not to a president. If I see an officer committing treason, even if he outrank me, I have a duty to report him for treason regardless of the rank.

No active duty service member, civil service member, or political appointee is obliged to comply with an illegal order. If this were not true, then the judges at Nuremberg were wrong. "I was only following orders" becomes a valid defense.