According to the Navy, ships like the Loyal have only a single mission: "to gather underwater acoustical data" in support of "the antisubmarine warfare mission" of fleet commanders.

Stalwart class ships were originally designed to collect underwater acoustical data in support of Cold war anti-submarine warfare operations in the 1980s.

The trace shown in Figure 1eis taken from a digitized recording of the male courtship song, and such acoustical data have been subjected to still further kinds of time-series analysis [ 20 21 22 ] .

The Technical Services Division of the FBI studied the acoustical data and issued a report on December 1, 1980 (dated November 19, 1980).

Stalwart and her sister ships were designed to collect underwater acoustical data in support of Cold War anti-submarine warfare operations in the 1980s.