He was credited with the destruction of one four-engine bomber.

Of his 25 victories claimed over the Western front, four were four-engine bombers.

Included in his victory total are 24 four-engine bombers.

Among his victories over the Western front are at least 2 four-engine bombers.

Three months later, he is fully recovered, and the crew board their new four-engine heavy bomber.

All his victories were recorded over the Western front and included 26 four-engine bombers.

Of his 17 victories recorded over the Western front, 3 were four-engine bombers.

He claimed 26 victories over the Western front, including 18 four-engine bombers.

Of his eight victories recorded over the Western front, 2 were four-engine bombers.

Later that month, Unger added a total of eight four-engine bombers shot down.