The reason DA Form 3126-1 looks the way it does is that a file has to speak for itself. Officially APPLICATION AND CONTRACT FOR ESTABLISHMENT OF A NATIONAL DEFENSE CADET CORPS UNIT, it serves to application and agreement for establishment of a national defense cadet corps unit (s&i milpercen), and the record it produces outlasts the people and the circumstances behind it. Edition 04/01/2023, status ACTIVE, is the version published here: 3 page(s), close to 200 fields, each one present because some later reader will need that fact without being able to ask for it. Because a subsequent edition has appeared, this copy stays available — a record made under one edition is interpreted under that edition.
Behind any Army form sit two separate decisions. What the document asks is settled by G-1, which maintains and revises it. Whether you raise it, and where it goes once signed, is settled by AR 145-2. That division is the reason a form can outlive several changes in the process it serves.
The heading blocks come first because the record is retrieved by them, not read into. Name as official records spell it, identification number, unit, date of preparation — those four are the index, and everything below them is content that only surfaces once the index has done its work. A form filed under a name written casually is not lost in principle, only in practice, which amounts to the same thing.
Tab order is not a convenience feature; it was fixed when the form was built and generally traces the page, so following it produces the sequence the designer intended and leaves fewer gaps than a mouse. Exclusive option groups clear the previous selection because the record is not permitted to hold two contradictory answers. Single-line fields do not wrap for the same reason the layout is fixed: the printed page has to fall in known positions, so text past the field width is cut at the margin even though the screen still shows it whole. Overflow belongs in remarks or on a continuation, where there is room designed for it. And an inapplicable field is marked rather than skipped, since a blank tells a later reader nothing about whether the question was considered.
Signing is the act that makes the document evidence, and until it happens the entries are only a proposal. Additional signatures — reviewer, approver, witness — each stand for a separate judgement, dated when applied so the record shows who accepted what and in what order. The common faults all damage that record in the same way: a blank mandatory field breaks the chain of required answers, swapped digits in an identification number detach the document from its subject, an inverted day and month misplaces it in time, and stale data from a reused copy states things nobody meant to state.
The Privacy Act statement is on the page because collecting personal information requires the collector to disclose the terms first — the authority relied on, the purpose, the routine uses, and whether an answer is required or may be withheld. That order is the point: the statement is read before the entries it governs, since consent given afterwards is not consent. Once completed, the copy is a personal record and carries the handling obligations that attach to one.
Download the form
The published formats — PDF — reflect the range of places a form gets filled in. Where there is a computer, the fillable pdf supplies live fields that keep entries positioned and readable. Where there is not, the printable pdf gives the identical page as flat artwork for pen entry. The distinction is one of setting rather than of authority; the page is the same document in both.
The choice of application decides whether your work survives. Browsers render pdfs as documents to be read; where a viewer shows fields without a mechanism to store them, typed text disappears when the tab closes, and nothing announces the loss. A full reader treats the file as a form and preserves entries on save.
No charge and no account apply: these are published documents, and access to them is not something a distributor is entitled to price.
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
Disposition is prescribed, not chosen. AR 145-2 names the destination, whether that is a specific office, the unit administrative channel or the personal record, and the applicable records schedule governs how long it survives there. Both rules exist to keep the file consistent across offices with different habits. Take your copy before the document leaves, since it will not come back.
Series and number are how the DA series signals which documents belong together, and the grouping follows real process boundaries: a shared proponent or directive usually means a shared purpose. A form cited on the face of another is part of that same transaction, and continuation sheets, covers and transmittals complete it.
An edition marks the form at a point in a process that keeps moving, and the date printed on the page is what distinguishes one from another. Since a saved file never announces its own obsolescence, compare its date against the current edition before using it again. Prior executions remain valid: the change applies forward, and a record is read against the edition it was written under.
A word on where this page sits. These are reproductions of published Department of the Army documents, made available by an independent site with no official role and no authority to issue forms. The structure described above — proponent, prescribing directive, records schedule — exists apart from this site entirely, which is why nothing written here is legal advice and why acceptance by any office is not something that can be promised. Put questions of entry, requirement or eligibility to G-1 or to the administrative office servicing your unit.
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