Potential answers for "''The backbone of the Marines''"

⭐⭐⭐⭐ PFCS
⭐⭐ SACRUM
⭐⭐ KEEL
⭐⭐ ITTO
⭐⭐ TIMID
⭐⭐ URALS
⭐⭐ AWOL
⭐⭐ CORPS

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Queen dowager of the 1540s   State with a 45 mi. northern border   Uncompromising