The latest stable version is 1.1 and was updated in 2004.

Other published versions of Ehret's books may also have been updated.

The version of the game downloadable from Steam has been updated to include these changes as well.

This version has been updated to contemporary 1926 standards.

The original version was last updated on June 27, 2004.

The latest version is 1.0, and has not been updated before.

A 46th star had previously been added to the Army color in 1908, and the blue version was also updated to have 48 stars.

This latest version has been updated with amendments in section 2.3, 3.6 and 3.8.

This version has been heavily updated compared to its predecessors.

These versions were updated by the author to make them less rooted in the 1950s.