[chx]

According to official report https://assets.documentcloud.org/documents/4165320/USS-Fitzg... it played a part for sure:

8.4 Fatigue

The command leadership allowed the schedule of events preceding the collision to fatigue the crew.

The command leadership failed to assess the risks of fatigue and implement mitigation measures to ensure adequate crew rest.

[dTal]

Here is a very scathing and informative commentary on the Navy's "risk assessment" and "mitigation" procedures:

https://news.ycombinator.com/item?id=15120369

[chx]

There obviously is something very wrong with the entire system when this happens twice within a short timeframe.