Do not assume a particular person’s letter is the only possible evidence. Identify the facts that need proof and the reliable records or knowledgeable people available to explain them.
Build the account around supported facts
The absence of one supervisor does not remove the substantive knowledge and employment requirements. Have the evidentiary approach assessed instead of substituting unsupported praise from someone who did not know the work.
Identify the relevant organizational knowledge, how it was acquired and its use in the proposed work. Identify what the applicant knows about the organization’s product or processes and how the U.S. role uses it. The period may help explain what the employee learned without establishing the full-time foreign-employment requirement. A documented fixture-programming library, a heat-treat sequence tuned to a particular alloy or an inspection protocol built for a specific customer's parts are all candidates, provided they are written down somewhere and were developed inside the group. The person must have completed one continuous year with the related foreign organization during the preceding three years; L-1B stay is generally capped at five years.