(gdb) f 1
#1  0x08066780 in B_Save (sb=0xbfce9ddc, data=0x0)
    at src/client/cl_basemanagement.c:3090
3090                                            MSG_WriteString(sb, aircraftItems[aircraft->weapons[l].ammoIdx].id);
(gdb) p aircraft->weapons[l].ammoIdx
$1 = -1