File:US Navy 030321-N-9693M-006 Aviation Machinist's Mate 2nd Class David Lyman, left, tightens a fitting on a T-64 turbo shaft engine for an MH-53E 'Sea Dragon' helicopter, smooth bolt.jpg
US_Navy_030321-N-9693M-006_Aviation_Machinist's_Mate_2nd_Class_David_Lyman,_left,_tightens_a_fitting_on_a_T-64_turbo_shaft_engine_for_an_MH-53E_'Sea_Dragon'_helicopter,_smooth_bolt.jpg (288 × 196 pixels, file size: 23 KB, MIME type: image/jpeg)