Line SIERRA indicates the date/time contamination was initially detected.
This is given in
Line YANKEE designates the downwind direction of hazard and effective wind
Numbered Lines to Complete on NBC 1 (Chem/Bio) Report.
When an Initial or Subsequent NBC 1 (Chem/Biological) Report is prepared, the
lettered lines are preceded by six lines which identify the report. These
lines state the precedence, date/time of the report (LOCAL or ZULU), security
classification, sender, receiver, and type of report. The complete format
for an Initial NBC 1 (Chem/Bio) Report looks like Figure 4-3.
Format for Subsequent NBC 1 (Chem/Bio) Reports.
A Subsequent NBC 1 (Chem/Bio) Report has the same format. It will include
additional letters as more information is obtained. Additional Subsequent
NBC 1 Reports may be submitted until all known information has been
NBC 1 (Chem/Bio) Report