Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 7.0
Situational Awareness
ATC Issue All Types; Conflict Airborne Conflict; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued Advisory / Alert; Air Traffic Control Separated Traffic; Air Traffic Control Issued New Clearance; Flight Crew Executed Go Around / Missed Approach; Flight Crew Requested ATC Assistance / Clarification; General Flight Cancelled / Delayed
Airspace Structure; Human Factors; Procedure
Local control requested approval for an opposite direction operation for; a flight of 4 [military fighter jets] to Runway 27. It was some time before they actually departed. I forgot about the opposite direction approval. Meanwhile [Aircraft Y] was being vectored onto the ILS Runway 9 approach VFR. I cleared this aircraft for a practice approach to Runway 9 and switched the aircraft to tower. Then [the] flight of four departed. I am not sure how close these to aircraft were but way too close for my comfort. They were at least in my estimation 2 miles from each other at the same altitude at about 3000 feet. [Aircraft Y] was descending on the approach and [the flight of four] was ascending to 6000 feet. This situation was all my fault just a lack of focus on my part.
[Report narrative contains no additional information.]
Tower Controllers reported allowing an opposite direction operation to occur with less than required separation.  Training in the Tower was in progress at the time.