Is it true that a Green Card holder automatically gets US citizenship after 16 years of getting Green card

No you must file the form N-400 to become a citizen of the United States.

First time H1 b stamping with COS L1b to H1b

You need the packet from employer B for your stamping. Discuss the matter with your B company attorney. Your plan is complicated. Time to...

The time during college does not count. Time to consult with an immigration attorney in person.

What can I do if my OPT got denied and my grace period is over, is it useful to file motion to reconsider?

Time to consult with an immigration attorney immediately.

Can I join Marine Corp currently with D.A.CA Program?

No you cannot join the marine corps or any branch of the military unless you are a permanent resident.

H1B extension and transfer

You are subject to the cap because of the time that has gone by. You will need to go through the process again.

US tourist visa declined.

The visitor visa was denied because you are married to a US citizen and you may be considered to have immigrant intent which is not permitted for...

L-1 visa eligibility

Discuss your situation with the company immigration attorney or hire your own. The B-1 visa may cause issues for you.

You can still file for asylum right now. The circumstances you have described allow for filing past the presumptive one year bar. SEVIS...

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Is it ok that the AOS and financial documents are mailed first before the civil documents?

It is time for you to meet with a lawyer in person. Your questions indicate a possible misunderstanding of the requirements. Failure to follow...