Single Judge Application; This Court has held that “[l]ay testimony is competent . . . to establish the presence of observable symptomatology and ‘may provide sufficient support for a claim of service connection.’” Barr v. Nicholson, 21 Vet.App. 303, 307 (2007) (quoting Layno v. Brown, 6 Vet.App. 465, 469 (1994)). As this Court has often noted, “symptoms, not treatment, are the essence of any evidence of continuity of symptomatology.” Savage v. Gober, 10 Vet.App. 488, 496 (1997); see also Wilson v. Derwinski, 2 Vet.App. 15, 19 (1991) (noting that the “regulation requires continuity of symptomatology, not continuity of treatment”);