Arp was founded in 1921 and chartered by the united states congress in 1976 to serve the american people as a focus for the interchange of knowledge between military and civilian medicine and science. Arp's mission is to:(1) provide leading-edge medical, scientific, professional, and administrative services to public and private sector organizations;(2) publish authoritative reference atlases to aid in the diagnosis of disease; and,(3) establish and maintain registries of pathology.

Services: medical, scientific, professional, and administrative services funded by the department of defense, national institutes of health, national institute of justice, and commercial organizations. education: publication of atlases of tumor and nontumor pathology used by pathologists worldwide to aid in the diagnosis of disease.