Regulations Respecting the Employment of Persons for One or More Specified Periods of Less Than Three Months Totalling Less Than Six Months in the Aggregate During any Consecutive 12-Month Period in the Department of National Defence in the Operational Category, in the Clerical and Regulatory, Secretarial, Stenographic and Typing and Data Processing Groups of the Administrative Support Category, in the Drafting and Illustration and Engineering and Scientific Support Groups of the Technical Category, and in the Education and Nursing Groups of the Scientific and Professional Category During the Period Beginning on April 9, 1992 and Ending on April 30, 1994