The chaplain of Minnesota Gov. Tim Walz’s field artillery regiment said there is no excuse for the Democratic VP pick to have abandoned his National Guard unit before a critical deployment — not even running for Congress.

“In our world, to drop out after a WARNORD [warning order] is issued is cowardly, especially for a senior enlisted guy,” retired Capt. Corey Bjertness, now a pastor in Horace, North Dakota, told The Post.

Bjertness, 61, was the chaplain for the 1st Battalion, 125th Field Artillery, of which Walz was command sergeant major before retiring in 2005, two months before the unit deployed to Iraq. Walz has said he did so to run for Congress, and he was elected the next year.

“Running for Congress is not an excuse,” Bjertness said of Walz’s decision to quit. “I stopped everything and went to war. I left my wife with three teenagers and a 6-year-old and I was gone for 19 months.”