http://forums.radioreference.com/california-radio-discussion-forum/219243-lassen-volcanic-national-park.html - new radio system - Sept 2011 thread - info on P25 also
https://www.nps.gov/lavo/learn/management/upload/LAVO-Fire-Management-Plan-web-2012.pdf - 2012 fire management plan - they have 1 type 6 engine + 1 lookout + 1 10 person fuels crew - dispatched by Susanville Interagency Fire Dispatch Center
Lassen Volcanic National Park also owns a Type 1 or Type 2 structural fire engine which is staffed by a local FD - per https://www.nps.gov/fire/structural-fire/what-we-do/engine-company-parks.cfm - Park HQ is at Mineral - perhap the engine is there - 5/30/2018