The 501st Marine Strike Group was an element of the Starfleet Marine Corps in Starfleet International, assigned to Starfleet Marine Corps Fifth Brigade, Fourth Battalion.
- The 501st Marine Strike Group was a marine strike group embarked on the Crusader-class starship USS Crusader during at least the last quarter of the 24th century.(Citation needed)
- The unit motto was Dum Vivimus, Vivamus (English: Let us live while we live).
|United Federation of Planets Starfleet Marine Corps Marine Strike Groups|
|1st MSG | 7th MSG | 9th MSG | 11th MSG | 41st MSG | 69th MSG | 78th MSG | 86th MSG | 136th MSG | 263rd MSG | 377th MSG | 501st MSG | 503rd MSG | 512th MSG | 555th MSG | 565th MSG | 631st MSG | 640th MSG | 654th MSG | 669th MSG | 674th MSG | 677th MSG | 695th MSG | 696th MSG | 711th MSG | 724th MSG | 728th MSG | 731st MSG | 740th MSG | 742nd MSG | 750th MSG | 755th MSG | 769th MSG | 771st MSG | 781st MSG | 791st MSG | 801st MSG | 832nd MSG | 849th MSG | 911th MSG|