Some of the most expensive fighters such as the US F-14 Tomcat, F-15 Eagle, F-22 Raptor and Russian Su-27 were employed as all-weather interceptors as well as air superiority fighter aircraft, while commonly developing air-to-ground roles late in their careers.
The health service measures that best predict subjective health status should be identifiable. Following her further degree in clinical epidemiology and biostatistics, her interest turned to the development of methods to measure subjective health status.
Subjective is what goes on in your own mind, 'subject' to heavy personal bias. Objective is an unbiased appraisal of the situation, normally corroborated by others or additional supporting evidence or predictive evidence that comes to pass based on observations or theories.