Is it military ordinance?

[etiennesw]

Is this a military ordinance?

Did not recover it and put it back. Need to know if it's even a bomb or just some random cylinder, before informing authorities.

Case is broken open with bottom section being hollow, however upper section has some rod embedded a metallic body.

 

[US-Subs]

While you are on one of the best sites on the internet for ordnance questions, this is not a question that should be put to random strangers on the internet whom you cannot judge their qualifications and have no responsibility in the outcome.
Assessing and identifying potential hazards can be a dangerous and risky task, and should be done by professionals on location and in person. When you have any reasonable suspicions you should simply notify them and let them make that judgement for themselves, in person. There are thousands of different hazardous items out there waiting to be found, trying to do an identification/assessment of a heavily corroded item from an internet photo is not something that any knowledgeable or professional person would do. Call your local authorities.