Hootin' and Hollerin'

PMS has many meanings in the Army:

PMS ¹portable monitoring set, ²program management support, ³planned maintenance subsystem, ⁴professor of military science, ⁵plant monitoring system, ⁶probable maximum surge, ⁷processor, memories, and switches, ⁸production management support, ⁹policy management system, ¹⁰project management system, ¹¹PACOM munitions storage, ¹²performance monitoring system, ¹³Pipeline Management System (USAF), ¹⁴planned maintenance support, ¹⁵power management system, ¹⁶performance measurement system, ¹⁷planned maintenance system, ¹⁸production management specialist

POO just has one:

POO [AR 310-50] priority operational objective

from: http://www.fas.org/news/reference/lexicon/acronym.htm