WASHINGTON, October 17--Flooded with volunteers, the Army today ordered the discharge by January 1 of all remaining soldiers who were drafted in 1945.

The announced aim of this and other orders is to lop off a fourth of the Army's existing strength by the year's end.

The new directives included instructions by the Air Forces to discharge some 8,700 wartime air officers still on active duty in addition to those quitting active service voluntarily.

Aiming at a total strength of 1,310,000 by December 31, the War Department:

1. Ordered the discharge of the last of the 1945 non-volunteers in time for completion of their terminal leave by the end of December.

2. Directed commanders to screen all rosters and eliminate as surplus all non-volunteers deemed to be unfit for their assigned duties, and those who have shown "ineptitude for military service."