People who were assigned female at birth are exempt from registering for the Selective Service. I could have chosen to request a Status Information Letter, which would tell anyone who needed to know (such as some potential employers, or a financial aid office) why I hadn’t registered. This is the only option for trans men who became legally male for selective service purposes after their 26th birthday.
Since I’m still a few years shy of 26, getting an exemption seemed to me a lot of hassle for no reason. On May 15, I visited the Selective Service’s website, and registered. It only took about 30 seconds. On May 30, I got my selective service card in the mail. In the event of a draft, I would be found unfit to serve anyway due to my trans status–which is fine by me.