nuclear

Another embarrassing incident for the US military.

This is fine in a chatty context (say a blog, or something like that), but it's not actually a complete sentence and wouldn't be appropriate in a more formal context. You could say: "In another embarrassing incident for the US military, one of its..." (this is a typical journalistic style). I'm assuming this is part of the

Can "misconduct" be countable?

I join in GG's question. Also, I'm inclined to take the first phrase as a headline. Other than those caveats, I like it. - A

Edit. I also join in Wordy's preference for "has led." When you say "is the latest in a series," you imply that the series is open-ended. Simple past seems to conflict with this, possibly qualifying it as a grammatical error.

Edit Ed

I think of it as sort of a headline. CNN correspondants occasionally start their reports with an incomplete sentence. I thought it was common so I mimicked the style.

Any suggestions for the replacement of misconducts?

I don't know if it's necessary to replace it. (It sounded like GG's in the same boat.)

In my case, I don't even have any idea of how to go about checking on it - can it be countable, or not?

Let's cross the "replacement" bridge when we come to it (just a suggestion.) - A.

Thanks, Avangi. Your reply makes me uneasy a bit because it seems like my sentence is not something a native speaker would say. Could you make a suggestion for a natural sounding sentence that conveys the same meaning?

I'm embarrassed. Were it not for GG and Wordy, I would have bought it, no problem. - A.

Another embarrassing incident for the US military. One of its nuclear powered submarines was found leaking radioactive water during routine maintainance. This is the latest blow in a series of serious misconducts which led to the resignations of two top Pentagon officials...

I see this as a little fluffy and not to the point. Let's try it a different way:

During a routine ins

aNtiAmericaNiDoL It's pretty ridiculous that governments actually store radioactive waste along the ocean floor.

Hi, AA, I'm missing the connection. - A.

Misconduct implies deliberate bad actions, instead of incompetence or errors. I don't know what happened - if someone deliberately ignored a problem, that's misconduct. Is that what happaned? Otherwise, I support embarrassing incident.
(Note the "it's" above should be "its.")