What are the procedures for a Commissioned Officer to submit an application to become a Warrant Officer 153A?

Sir, don’t want to give out any false information so my suggestion is visit http://www.usarec.army.mil/hq/warrant/

They have contact information for Warrant Officer Recruiters who are better suited to answer questions pertaining to your situation. Best of luck!

Non-Army Personnel
A joint service agreement allows servicemembers who are selected for this program to be discharged from their service and enlisted in the Army. Applicants must apply for this program while on active duty and must have 12 months or more remaining on their enlistment contract; civilians must contact their local Army recruiter. Applications are forwarded from the individual to United States Army Recruiting Command (USAREC). After screening, the application is forwarded to the appropriate proponent who evaluates the applicants' technical experience and determines if the applicant is qualified to compete against other qualified applicants for the limited warrant officer positions. Applications from those who are not technically qualified will be returned to the applicant without further processing. Further requirements for Non-Army personnel are listed below under "Additional Requirements For Non-Army Personnel".
A selection board will consider fully qualified applications. Selection is highly competitive and board members select applicants based upon the whole person concept. Leadership and technical abilities will be evaluated and only the best qualified will be selected.
As of November 2017 ~ Commissioned Officers from the Air Force, Navy, Marines, and Coast Guard CAN apply through the in-Service Warrant Officer Selection Board (WOSB) for 153A (Initial Entry Rotary Wing Course-Flight School). In addition to all other requirements, they will need a Conditional Release (DD Form 368) approved by their respective Commander and personnel office and a conditional resignation of commission memorandum (see Downloads tab for samples). All (non-aviators) officers that desire to be boarded for 153A will be boarded once per fiscal year in January. Clarification for sister service officers as mentioned above: if selected by the board, HRC will consider officers with an approved and valid conditional release and/or separation orders or DD214s as separated AT THE TIME OF APPOINTMENT for Initial Warrant Officer Appointment. The new appointment would be based upon the USAREC in-Service WO board selection AND subsequent receipt of Confirmed Appointment Scroll. The scroll may take more than six months to process and HRC Officer Accessions Branch works closely with applicant for any issues with the scrolling process. Rank for sister service officers as mentioned above: Initial WO appointment is to the rank of WO1. Upon acceptance of appointment, former Commissioned Officers may apply to HRC promotions for recognition of their previous commissioned time in order to receive a Regular Army promotion to CW2. This process will take several months in order to generate and receive a confirmed promotion scroll. Upon receipt of a confirmed Regular Army scroll, service member can be promoted to CW2 with a Date of Rank (DOR) adjusted to the first date of eligibility (i.e. day after WOBC if applicable

Here is a great resource: http://www.usarec.army.mil/hq/warrant/prerequ/woft.shtml

I'm a USMC officer too and I've also been considering a similar path after my first tour. Have you thought about renewing your active contract then getting a conditional release?

You would be applying as a prior service officer and if you move to the IRR you may need a release from the Reserve if selected for the Warrant Officer Flight program. On a side note, your Commissioned service would count towards your retirement. Your time as a WO1 isn’t considered commissioned service time. But once you make CW2 you’ll be earning commissioned service again. Good luck, I think it would be hard to go from being an O to a WO. I’m sure there are a few on this forum who made the switch.

Just wondering, have you looked into the Coast Guard? I've been out for awhile, but you may qualify for Direct Commission and flight school. Coast Guard officers fly way up into their careers, and you wouldn't lose any commissioned service time.