▁defense ▁and ▁provide ▁slow ▁arm or ▁reg ener ation , ▁such ▁as ▁shield s ▁and ▁nan om ach ines . ▁Other ▁up gr ades ▁give ▁players ▁b ount ies ▁for ▁killing ▁certain ▁enemies , ▁and ▁bon uses ▁for ▁mass ▁kill ings ▁of ▁enemy ▁troops . ▁ ▁There ▁are ▁also ▁up gr ades ▁that ▁allow ▁players ▁to ▁custom ize ▁up ▁to ▁five ▁different ▁weapon ▁profiles , ▁which ▁can ▁be ▁switched ▁mid - game , ▁or ▁allow ▁players ▁to ▁change ▁the ▁angle ▁of ▁their ▁weapons ▁to ▁adapt ▁to ▁changing ▁strateg ic ▁situations . ▁ ▁As ▁the ▁game ▁progress es , ▁more ▁weapons ▁and ▁items ▁are ▁made ▁available . ▁The ▁f ighter ▁the ▁player ▁starts ▁with ▁only ▁has ▁sl ots ▁for ▁two ▁front ▁weapons ▁and ▁rather ▁limited ▁ship ▁up gr ades . ▁The ▁T M IG - 2 2 6 ▁has ▁sl ots ▁for ▁one ▁bomb ing ▁system , ▁one ▁miss ile ▁system , ▁three ▁front ▁weapons , ▁and ▁one ▁rear ▁weapon . ▁Some ▁weapons ▁can ▁only ▁be ▁used ▁in ▁the ▁front ▁or ▁rear ▁sl ots . ▁There ▁is ▁a ▁large ▁variety ▁of ▁weapons , ▁r anging ▁from ▁fl am eth row ers ▁to ▁electro - ball s ▁to ▁acid ▁guns . ▁Most ▁weapons ▁can ▁be ▁upgrad ed ▁after ▁they ▁are ▁bought . ▁This ▁may ▁enh ance ▁power , ▁project ile ▁velocity , ▁rate ▁of ▁fire , ▁or ▁the ▁nature ▁of ▁the ▁attack ▁itself . ▁When ▁view ing ▁the ▁status ▁of ▁an ▁individual ▁weapon , ▁meters ▁are ▁shown ▁that ▁indicate ▁its ▁power , ▁heat ▁generation ▁and