Doctrine reference
Everything the 1380 Tool enforces, sourced to AR 140-185.
The tool reads from the same regulation Pay reads from. Browse by the duty type you're filing — written in plain English with citations — or by section, the verbatim quotes you'd hand to finance.
Soldier lens
By duty type
Plain-English summary, when to use, when not to use, and how it appears on the form — for each of the five duty types you might file.
Admin / auditor lens
By section
Verbatim regulation text, paragraph numbers, and signed/dated sources. The full reference page is the one to hand to finance.