From the article
Izbicki said he eventually decided that his Christian beliefs forbid him from killing. He initially hoped he could continue his career in a noncombat role, but ultimately decided he could not support war in any way, he said.
He said to them, "But now let the one who has a moneybag take it, and likewise a knapsack. And let the one who has no sword sell his cloak and buy one. - Luke 22:36
For the one in authority is God’s servant for your good. But if you do wrong, be afraid, for rulers do not bear the sword for no reason. They are God’s servants, agents of wrath to bring punishment on the wrongdoer. - Romans 13:4