Tower controllers reported allowing an opposite direction operation to occur with less than required...

Attributes
ACN	1445533
Time
Date	201705
Local Time Of Day	1801-2400
Place
Locale Reference	DLH.Tower
State Reference	MN
Aircraft 1
Make Model Name	Fighter
Operating Under FAR Part	Part 91
Flight Phase	Takeoff
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft Low Wing 1 Eng Fixed Gear
Flight Phase	Final Approach
Route In Use	Visual Approach
Flight Plan	IFR
Person 1
Function	Approach
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 7.0
Person 2
Function	Local
Qualification	Air Traffic Control Developmental
Events
Anomaly	ATC Issue All Types Conflict Airborne Conflict Deviation - Procedural Published Material / Policy

Narrative:

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.

Original NASA ASRS Text

Title: 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.

Narrative: 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.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

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.