Antal stated he could not serve as a chaplain for an "empire" and could not "reconcile his duty to protect and defend America and its constitutional democracy and his commitment to the core principles of his religious faith including justice, equity and compassion and the inherent worth and dignity of every person" with policies of the United States.

His letter of resignation stated that he resigned because he could not support "unaccountable killing: through the U.S. armed drone policy and the Executive Branch claiming "the right to kill anyone, anywhere on earth, at any time, based on secret evidence, in a secret process, undertaken by unidentified officials."

Antal also cites his opposition to the U.S. nuclear weapons policy calling it a policy of "terror and mutually assured destruction that threatens the existence of humanity and the earth."

In his letter of resignation, Antal refuses to support the U.S. policy of "preventive war, permanent military supremacy and global power projection" in what he calls "imperial overreach through extra-constitutional authority and impunity from international law."

From September 2012 through February 2013 Chris Antal was an Army chaplain to a signals battalion supporting the 3rd Infantry Division at Kandahar Airbase in southern Afghanistan. While his unit did not have operational responsibilities for drones, Chaplain Antal saw drones launch and land  where he gave services for military personnel killed in Afghanistan and whose remains were being transported back to the United States.  Additionally, he was concerned about the use of drones after hearing about a drone attack in which a grandmother had been killed while picking okra in a field near her home in the region around the military base.

On Veterans' Day 2012, identifying himself as an Army chaplain in Afghanistan, , he posted "A Veterans' Day Confession for America" on the Unitarian Universalist site, A Quest for Meaning, in the form of a poetic testimony (full text at http://www.questformeaning.org/military-2/a-veterans-day-confession-for-america/).

Antal wrote, "We have sanitized killing and condoned extrajudicial assassinations…war made easy without due process, protecting ourselves from the human cost of war./We have deceived ourselves…denying the colossal misery our wars inflict on the innocent."  He had delivered this sermon during a worship service  of military personnel and contractors who had freely gathered for a service in the Unitarian Universalist tradition  at Kandahar Air Base.

Antal's commanding officer was informed about his article, told him "you make us look like the bad guys" and "the message does not support the mission."

The commander said he had lost confidence in Antal and had him investigated, grounded from travel and officially reprimanded by a letter from a general officer at Division level.  He was sent back to the U.S. with a "do not promote" evaluation and discharged from active duty. Antal challenged the punishment through New York Senator Gillibrand and her congressional inquiry resulted in his re-activation and promotion to Captain in the U.S Army Reserve.file:///Users/Owner/Downloads/DisarmamentTimesFinalsummer2015%20(1).pdf

The Rev. Antal spoke on March 30, 2016 at the Veterans for Peace symposium "Inside Drone Warfare: Perspectives of Whistleblowers, Families of Drone Victims and Their Lawyers," held at the University of Nevada Las Vegas Law School with military and CIA drone whistleblowers.  The symposium was held during the week of vigils called "Shut Down Creech 2016" at Creech Drone base, 60 miles outside of Las Vegas.

Rev. Antal said that the U.S. Army had changed its policy on the duties of chaplains to silence dissent on military policies that concern speaking with a "prophetic voice" and on issues of "moral turpitude."