Okay so current timeline availability for Mercenaries:-

Vol 1 - Griffin-1DS/-2N/-3M

Vol 2 - Ostscout-12R, Bushwacker-X4

Vol 3 - Puma (WD only), Battlemaster-3M/-6C/-6G

Vol 4 - Wasp-4W (WD only)/-5A, Blackjack-5, Trebuchet-9N, Awesome-11H, Warhammer IIC 2

Vol 5 - Mad Cat, Marauder II-5C (WD Only)/-6A/-6C

Vol 6 - Linebacker (KH Only), Cataphract-5L, Marauder-11D/-2T/-5D/-5M/-5S/-5C/-7M/-7R/-7S

Vol 7 - Koshi, Vixen/2/3/7/8, Ryoken, Warhammer C 2/C 3 (WD Only)/-10K/-7A/-7M/-7S/-8R/-9K

Vol 8 - Dasher, Rifleman C 3/-5D/-5M/-7N/-7N2

Vol 9 - Valkyrie C/-QD/-QD6/-QDD, Shadow Cat

Vol 10 - Hermit Crab-13/-14/-15, Mongoose-96, Archer Wolf (KH & WD Only)/-2Rb/-4M/-4M2/-5R/-5W, Highlander-740

Vol 11 - Uller, Phoenix Hawk-2K/-3M/-4M/-9

Vol 12 - Shadow Hawk-2Hb/-5M/-5R/-5S/-7H, Black Knight-18KNT