If you commission in to the Air Force as a non-rated officer (not a pilot, navigator, air battle manager) you'll be required to serve 4 years active duty. Pilots are required to serve 10 years. Basically it would be 8 years active (2ish years for flight school, 6 years actually flying) then 2 years inactive........
Stumbling block. For other uses, see Stumbling block (disambiguation). A stumbling block or scandal in the Bible is a metaphor for a behavior or attitude that leads another to sin.
Definition of block for Students. 1  1 : a solid piece of some material usually with one or more flat sides a block of ice. 2  2 : an area of land surrounded by four streets in a city. 3  3 : the length of one side of a city block.  4 : a number of things thought of as forming a group or unit a block of seats.