…186 (9th Cir. 1987). And the Government has clearly long been on notice that issues surrounding the NPA are at the heart of this case. District courts "should freely allow an amendment when doing so will aid in presenting the merits and the objecting party fails to satisfy the court that the evidence would prejudice that party's action or defense on the merits." Developers Sur. & Indem. Co.' Bi-Tech Const., Inc., 979 F. Supp. 2d 1307, 1320 (S.D…