MIL-PRF-5606H, PERFORMANCE SPECIFICATION HYDRAULIC FLUID, PETROLEUM BASE; AIRCRAFT, MISSILE, AND ORDNANCE (7 JUN 2002) (SUPERSEDING MIL-H-5606G)., This specification describes the characteristics and provides the requirements for a petroleum base hydraulic fluid for use in the -54°C to +135°C temperature range (see 6.1). This fluid is identified by military symbol OHA and NATO Code No. H-515 (see 6.5).