Elon Musk sets internet on fire with cryptic tweet about dying 'under mysterious circumstances'

Here's a head scratcher.
SGT James Murphy, CPT Jack Durish,
SPC Gary Welch, SGT Mark Anderson,
CPL Douglas Chrysler, Maj Marty Hogan,
CSM Charles Hayden, SMSgt David A Asbury,
MSgt Robert "Rock" Aldi, SSG William Jones,
SSG Michael Noll, MAJ Dale E. Wilson, Ph.D.
SGM Erik Marquez, CW3 Harvey K.
SFC William Farrell, CPL Ronald Keyes Jr
Sgt (Join to see), SSG (Join to see)
1SG Dan Capri, LTC (Join to see)