Hello! I see you're encountering network error code 154140712 with Contra Returns when trying to connect to the USA server. I want to help you fix this so you can play smoothly.

To start, could you tell me a bit more about your network setup? For example:
- Are you using Wi-Fi or wired Ethernet?
- Are you on a home network or a public network?
- Have you tried connecting without a VPN or with a VPN before?
- Any other apps or games having similar connection problems?

Meanwhile, here are some step-by-step initial fixes most helpful for error code 154140712, especially related to server connection issues:

1. Check your internet connection: Make sure your network is stable and fast enough. Try restarting your router/modem.

2. Disable any VPN: If you are using a VPN, turn it off. Sometimes VPNs route traffic inefficiently or get blocked by servers.

3. Run the game as administrator: Right-click on the game executable and select "Run as administrator" in Windows.

4. Repair network settings (LSP repair): Sometimes network settings in Windows get corrupted. There are tools to repair the Layered Service Provider (LSP). I can guide you on this if you want.

5. Clear game cache or reinstall: If possible, clear the game cache or reinstall the app to fix corrupted files.

6. Try connecting via a VPN set to USA server: If your direct connection fails, a VPN with a USA location might help. Be sure to choose a reliable VPN.

If the above don't solve the issue, there might be server-side problems or advanced network blocks we can check.

Would you like me to guide you on the LSP repair step or using a VPN to connect to a USA server? Also, let me know about your current network status for tailored advice.