Information on the influence of employment mobility and career change on the flexibility of the physics labor force is provided, noting the past several decades have brought a dramatic roller coaster of changes to the physics community. Five sections are as follows: membership composition (demographics, professional self-identification, and location); employment (university, other academic settings, industry, national laboratories, and government); salaries (salaries and degree level, salaries and employment sector, salaries and geographic location for PhDs, and salaries and primary work activity); employment mobility and career change (introduction, early career change, mid-career change, retirement and late career change, and concluding remarks); and society membership comparisons and profiles. Six appendices offer information on dropping society membership, geographic divisions, and methodology, as well as statistical tables, definitions and technical notes, and questionnaire instruments and subfield list. Contains 10 references. (SM)