I remember in the early '80s, in the FDC, making the switch from charts and protractors to the TI calculator (with the fancy template). I sure hope the Marines are advancing their FDC technology as well as their guns.
Semper Fidelis,
LH
Back in the "old" Corps when I served (10th Marines - Camp Lejeune) the 105's in our Battery were mostly WWII vintage, probably via Korea. Every 6 to 8 years they were taken out of service and shipped to Albany GA for refurbishing. The Marine Corps takes pride in making equipment last.