A capability statement has one job: let a contracting officer qualify you in under a minute. Most fail because they are written like brochures instead of reference documents.
The one-minute test
UEI, CAGE code, NAICS codes, socioeconomic certifications, and a point of contact — above the fold, no hunting. If a CO has to search for your primary NAICS, you have already lost the minute.
Past performance belongs next, and it must be specific: agency, scope, period of performance. “Proven track record of excellence” is filler; “Department of the Navy, 2017” is evidence.
Match the language of the buyer
Frame capabilities in the terms agencies procure under — the PSC and NAICS categories they actually search. The goal is to be findable and checkable, not impressive.