In most cases, you also have to show that you have sufficient funds to cover the expenses of the visit, and return passage. There is no specific list of documents which must be submitted to prove each of these points. For example, to show residence in Japan, you must show that you have ties to this country. Proof of employment, family ties or other connections, or home ownership will satisfy this requirement, and should be submitted with your application. You might be asked to provide evidence that you will be able to support yourself financially during your stay.
Old passport containing previous visas are also useful.
Temporary visitors must show that they are eligible under all provisions of the immigration law. This means that while police or medical certificates are not ordinarily required, the embassy may request such documents in cases where the applicant has a criminal record, or a medical problem. You will be asked how long you plan to stay in the United States. However, please note that the length of the visa does not equate to a length of stay. They will determine the amount of time you will be permitted to remain in the United States.