Do I have to attend ALC to become a technical warrant officer?

Check with your training NCO for the answer, he or she should have the answer you need.

Use the recruiting website to find out everything in reference to going warrant. Each MOS is different and has different requirements. 915A does require you to be an ALC graduate. Sometimes certain requirements can be waived unless it specifically states no waivers. I would contact the recruiter for that specific MOS and ask if it can be waived or to verify your eligibility. Go to the link and find out the POC and more details. https://recruiting.army.mil/ISO/AWOR/915A/

This is a resource that can give you generalizations: https://recruiting.army.mil/ISO/AWOR/

However, the one who is going to be able to answer that question definitively is your ascension NCO who usually works with retention. If you’re a Reservist, ARCD could probably help too.

Every Warrant MOS has different prerequisites, but they all require ALC. When a Warrant MOS is hurting for applicants they may waive the requirement, but they have the Soldier attend ALC after being selected because that's where you learn the advanced technical skills specific for your MOS.
You should sit down with the Warrant Recruiters on your post. They are part of the SORB, so wherever the SF recruiters are, you can find the Warrant Recruiters.

Certain Warrant Officer designations require ALC ask your warrant he/she may also be able to help also if you check out the Ft Rucker website they may have updated info on requirements for warrants seeing how that is where they go for WOBC

With a few exceptions, yes, you have to have ALC. More knowledge won’t hurt anyhow.

If you aren’t able to understand the recruiting website, your best bet is to contact the actual Warrant recruiters to clarify. Some tech warrant MOS’s require a certain grade and TIG (along with NCOERs)

ALC is a prerequisite

ALC can be waived, I had to friends go 915A without it.

Nope! But it is a must have.