From Ammoland:

Garcia sent a lengthy six-page resignation letter (embedded below) laying out his reasons for leaving the Bureau after 18 years of service. He explains that he didn’t do the job for money or “fun.” He wanted to put violent criminals behind bars. But lately, he doesn’t feel like he knew what the mission was anymore. He was asked to do things that didn’t make sense, and when he asked “why,” he was always told because “they” said so.