Both her patrols were as part of the 6th U-boat Flotilla.

U-173 began her service career with training as part of the 4th U-boat Flotilla.

Her service began with training as part of the 4th U-boat Flotilla.

She was part of the 8th U-boat Flotilla, a training organization.

U-516 began her service career with training as part of the 4th U-boat Flotilla from 10 March 1941.

Both of which were part of the 6th U-boat Flotilla.

U-40 conducted only two war patrols during her career, both while part of the 6th U-boat Flotilla.

U-39 conducted only one war patrol during her entire career, as part of the 6th U-boat Flotilla.

In her short career she conducted only two patrols, both as part of the 7th U-boat Flotilla.

U-544 began her service career with training as part of the 4th U-boat Flotilla from 5 May 1943.