[gusmd]

Some stuff (TL; DR) from the linked DoD fact sheet:

- The applicant must have been in valid, legal status, for the last 2 years (no need to have been in the same status during those 2 years);

- Must not have had any single absence from the US longer than 90 days during those two years;

- Must commit to at least 4 years of Active Duty service.