As indicated in GN 01726.220.D.4.c., question 1 of form SSA-2960-NL must be completed in certain situations to
indicate whether the worker was insured for U.S. benefits at the time of his/her death
or disability onset. In many cases this can be ascertained from an MBR on the worker's
SSN. If not an earnings record (ER) will be needed.