You need DA Form 3126-1, and this page gets you to the file and through it. Start with what the form is: APPLICATION AND CONTRACT FOR ESTABLISHMENT OF A NATIONAL DEFENSE CADET CORPS UNIT, used to application and agreement for establishment of a national defense cadet corps unit (s&i milpercen). Check next that you have the right version — the edition dated 04/01/2023 is the one published here, and its status is ACTIVE. Then look at the size before you begin, because 3 page(s) and roughly 200 fields tell you how long this will take. Before you go further, note that a newer edition exists. Use this one only if you are looking at a record already completed on it.
Then work out your role. If the entries describe you, you fill them in and someone in the administrative section checks the result. If you handle records for others, you enter what they supply and pass the form along. In both cases the same two references govern you: G-1 maintains the form, and AR 145-2 sets out the trigger for using it and the route it takes. Read that directive before you start when anything about your case is unusual.
Start at the top of the page and work down. The heading blocks come first: write your name as it appears on your official records, then your identification number, then your unit or organisation, then the date you are preparing the form. Do not skip ahead to the interesting parts and come back — these heading entries are how your form is found in the file afterwards, and a form filed under a misspelled name is a form nobody can locate.
Now for the body. Use tab to advance through the fields; the order was set when the form was built and following it keeps you from leaving gaps. Check boxes and option buttons take a click. Where the options are mutually exclusive, choosing one will clear another, which is how the group is meant to behave. As you type longer entries, watch the field edge. One-line fields do not wrap, and anything past the edge prints missing even when you can still read it on screen — when that happens, put the text in remarks or on a continuation sheet. Leave nothing blank because it does not apply; enter the mark that means it does not apply, so the reviewer knows you read the question.
Leave the signature until everything else is done. Sign by hand or by an approved electronic means, and remember that a form without a signature is a draft, however complete the entries. Where a second and third signature are required — reviewing official, approving authority, witness — go in the order the blocks appear, and each signer dates the form on the day of signing. Then go back to the top and read what you wrote. Look first for a mandatory field you passed over, then for transposed digits in your identification number, then for a date with the day and month inverted. If you started from a file you had used before, look also for entries left from that earlier use; nothing removes them but you.
At some point while filling the form you will meet a Privacy Act statement, and you should read it when you reach it rather than after you finish. It tells you who is authorised to collect the information, what it will be used for, who else may see it, and whether you are obliged to answer or may decline. Once you have entered your details, treat the file accordingly: it now holds personal information about you, so store it and send it the way your office handles such records.
Download the form
Then choose a file to download. What you will see offered is PDF, and the only question you need to answer is whether you are typing or writing. Type, and you want the fillable pdf, where the entry areas respond to your keyboard. Write, and you want the printable pdf, which you print empty and complete with a pen. The layout does not change between them, so pick whichever fits how you plan to work today.
Once the file is on your machine, open it deliberately. A pdf will usually launch in your browser, which reads well enough but does not always hold what you type; certain viewers display the fields and then discard your entries. Save the download to a folder, open it from there in a dedicated reader, and test one field and one save before you commit to filling the whole thing.
One last point before you move on: every format is free. No registration stands between you and the file, and what you download is the published form, unaltered.
What the form asks for
- ACADEMIC
- ADDRESS
- ARMY
- AVAILB_A
- AVAILB_B
- AVAILB_C
- BUILD_A
- BUILD_A_1
- BUILD_A_2
- BUILD_A_3
- COURSES
- ContentArea1
- ContentArea2
- DATE_A
- DATE_B
- DENOMIN
- ELECTIVE
- ENROLLMENT
- EQUIPMENT
- ESTABLISH
- EXCLUS_A
- EXCLUS_A_1
- EXCLUS_A_2
- EXCLUS_A_3
Now send it on. Follow the routing in the prescribing directive, which will point you to a named office, to your unit administrative channel, or to your own file. Take a copy before you release it. From there the record follows the retention schedule for the series, and neither you nor the receiving clerk shortens or extends that on local judgement.
When another document has to travel with this one, find it by series and number. Forms in the DA series sharing a proponent or a governing directive are commonly used in combination, and anything cited on the face of your form generally goes with it. Assemble continuation sheets, covers and transmittals before you send the package rather than in response to a query.
The next time you open this form from your own files, check the edition date first. Revisions come from the proponent without warning to you, so the only reliable step is to hold your copy against the current edition before filling it in again. Records you already completed under a superseded edition stand, and you do not go back to rework them.
One last thing to be clear about before you download. What you get here is a copy of a published Department of the Army document. This site is not part of the Department of the Army, issues no forms of its own, and cannot tell you that any office will accept what you submit. Nothing written on this page is legal advice. When you are unsure about a particular entry, a requirement or whether you are eligible at all, ask G-1 or the administrative office that services your unit — they answer those questions and we do not.
Questions and answers
- What is DA Form 3126-1?
- APPLICATION AND CONTRACT FOR ESTABLISHMENT OF A NATIONAL DEFENSE CADET CORPS UNIT
- Which edition is current?
- 04/01/2023
- Who is responsible for this form?
- G-1
- In which formats can it be downloaded?
- PDF, PDF