I think telling them what you can offer at that immediate moment would get you into the police department faster than promising babes after the crisis which might never end. Sort of like how paper money might not buy you something in a z-poc but trading 100 rounds of ammunition still has value.
Tell them the truth: you are/were a Royal Canadian Army soldier and have combat experience. Even better if you show up with your own firearm. They'd be more likely to let you into their station knowing that rather than promising Kendra Wilkinson.
And the military will let you in? Hardly. You don't have the security clearence and you aren't a major contributor. Wow, you rely on other people a lot. Try again..
Kid that's how its going to be Everywhere!! People have got their own families and problems to worry about, Im pretty sure most people aren't going to stop to help random strangers off the streets episially if there is nothing in it for them or their famlies. Stop living in your fantasy world where you think everyone is kind and nice Wake Up kid!!